cmd/sgblog/http.go

   1 /*
   2 SGBlog -- Git-backed CGI/inetd blogging/phlogging engine
   3 Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU Affero General Public License as
   7 published by the Free Software Foundation, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU Affero General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 package main
  19
  20 import (
  21         "bytes"
  22         "compress/gzip"
  23         "crypto/sha1"
  24         "encoding/hex"
  25         "encoding/xml"
  26         "errors"
  27         "fmt"
  28         "hash"
  29         "html"
  30         "io"
  31         "log"
  32         "net/url"
  33         "os"
  34         "strconv"
  35         "strings"
  36         "text/template"
  37
  38         "github.com/go-git/go-git/v5"
  39         "github.com/go-git/go-git/v5/plumbing"
  40         "github.com/go-git/go-git/v5/plumbing/object"
  41         "go.stargrave.org/sgblog"
  42         "go.stargrave.org/sgblog/cmd/sgblog/atom"
  43         "golang.org/x/crypto/blake2b"
  44 )
  45
  46 const (
  47         AtomPostsFeed    = "feed.atom"
  48         AtomCommentsFeed = "comments.atom"
  49         TmplHTMLIndex    = `<html>
  50 <head>
  51         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  52         <meta name="generator" content="SGBlog {{.Version}}">
  53         <title>{{.Cfg.Title}} {{if .Topic}}(topic: {{.Topic}}) {{end}}({{.Offset}}-{{.OffsetNext}})</title>
  54         {{with .Cfg.CSS}}<link rel="stylesheet" type="text/css" href="{{.}}">{{end}}
  55         {{with .Cfg.Webmaster}}<link rev="made" href="mailto:{{.}}">{{end}}
  56         {{range .Cfg.GitURLs}}<link rel="vcs-git" href="{{.}}" title="Git repository">{{end}}
  57         <link rel="top" href="{{.Cfg.URLPrefix}}/" title="top">
  58         <link rel="alternate" title="Posts feed" href="{{.Cfg.AtomBaseURL}}{{.Cfg.URLPrefix}}/{{.AtomPostsFeed}}{{if .Topic}}?topic={{.Topic}}{{end}}" type="application/atom+xml">
  59         {{if .CommentsEnabled}}<link rel="alternate" title="Comments feed" href="{{.Cfg.AtomBaseURL}}{{.Cfg.URLPrefix}}/{{.AtomCommentsFeed}}" type="application/atom+xml">{{end}}
  60         {{if .Offset}}<link rel="prev" href="{{.Cfg.URLPrefix}}/?offset={{.OffsetPrev}}{{if .Topic}}&topic={{.Topic}}{{end}}" title="prev">{{end}}
  61         {{if not .LogEnded}}<link rel="next" href="{{.Cfg.URLPrefix}}/?offset={{.OffsetNext}}{{if .Topic}}&topic={{.Topic}}{{end}}" title="next">{{end}}
  62 </head>
  63 <body>
  64 {{with .Cfg.AboutURL}}[<a href="{{.}}">about</a>]{{end}}
  65 {{block "links" .}}
  66 {{if .Offset}}[<a href="{{.Cfg.URLPrefix}}/?offset={{.OffsetPrev}}{{if .Topic}}&topic={{.Topic}}{{end}}">prev</a>]{{end}}
  67 {{if not .LogEnded}}[<a href="{{.Cfg.URLPrefix}}/?offset={{.OffsetNext}}{{if .Topic}}&topic={{.Topic}}{{end}}">next</a>]{{end}}
  68 {{end}}
  69 {{- $Cfg := .Cfg -}}
  70 {{if .Topics}}<hr/>
  71 Topics: [<tt><a href="{{$Cfg.URLPrefix}}/">ALL</a></tt>]
  72 {{range .Topics}}[<tt><a href="{{$Cfg.URLPrefix}}?topic={{.}}">{{.}}</a></tt>]
  73 {{end}}
  74 {{end}}
  75 {{- $TopicsEnabled := .TopicsEnabled -}}
  76 {{- $datePrev := "0001-01-01" -}}
  77 <table border=1>
  78 <tr>
  79         <th>N</th><th>When</th><th>Title</th>
  80         <th size="5%"><a title="Lines">L</a></th>
  81         <th size="5%"><a title="Comments">C</a></th>
  82         <th>Linked to</th>
  83         {{if .TopicsEnabled}}<th>Topics</th>{{end}}
  84 </tr>
  85 {{range .Entries -}}
  86 {{- $dateCur := .Commit.Author.When.Format "2006-01-02" -}}
  87 {{- if ne $dateCur $datePrev -}}
  88         <tr><td colspan={{if $TopicsEnabled}}7{{else}}7{{end}}><center><tt>{{$dateCur}}</tt></center></td></tr>
  89         {{- $datePrev = $dateCur -}}
  90 {{- end -}}
  91 <tr>
  92         <td>{{.Num}}</td>
  93         <td><tt>{{.Commit.Author.When.Format "15:04"}}</tt></td>
  94         <td><a href="{{$Cfg.URLPrefix}}/{{.Commit.Hash.String}}">{{.Title}}</a></td>
  95         <td>{{.LinesNum}}</td>
  96         <td>{{if .CommentsNum}}{{.CommentsNum}}{{else}}&nbsp;{{end}}</td>
  97         <td>{{if .DomainURLs}}{{range .DomainURLs}} {{.}} {{end}}{{else}}&nbsp;{{end}}</td>
  98         {{if $TopicsEnabled}}<td>{{if .Topics}}{{range .Topics}} <a href="{{$Cfg.URLPrefix}}/?topic={{.}}">{{.}}</a> {{end}}{{else}}&nbsp;{{end}}</td>{{end}}
  99 </tr>
 100 {{end}}</table>
 101 {{template "links" .}}
 102 </body>
 103 </html>
 104 `
 105         TmplHTMLEntry = `{{$Cfg := .Cfg}}<html>
 106 <head>
 107         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 108         <meta name="generator" content="SGBlog {{.Version}}">
 109         <title>{{.Title}} ({{.When}})</title>
 110         {{with .Cfg.CSS}}<link rel="stylesheet" type="text/css" href="{{.}}">{{end}}
 111         {{with .Cfg.Webmaster}}<link rev="made" href="mailto:{{.}}">{{end -}}
 112         {{- range .Cfg.GitURLs}}
 113         <link rel="vcs-git" href="{{.}}" title="Git repository">{{end}}
 114         <link rel="top" href="{{.Cfg.URLPrefix}}/" title="top">
 115         <link rel="alternate" title="Comments feed" href="{{.AtomCommentsURL}}" type="application/atom+xml">
 116         {{if .Parent}}<link rel="prev" href="{{.Cfg.URLPrefix}}/{{.Parent}}" title="prev">{{end}}
 117 </head>
 118 <body>
 119 {{with .Cfg.AboutURL}}[<a href="{{.}}">about</a>]{{end}}
 120 [<a href="{{.Cfg.URLPrefix}}/">index</a>]
 121 {{if .Parent}}[<a href="{{.Cfg.URLPrefix}}/{{.Parent}}">prev</a>]{{end}}
 122 [<tt><a title="When">{{.When}}</a></tt>]
 123 [<tt><a title="What">{{.Commit.Hash.String}}</a></tt>]
 124
 125 {{if .Topics}}
 126 <hr/>
 127 Topics: {{range .Topics}}[<tt><a href="{{$Cfg.URLPrefix}}?topic={{.}}">{{.}}</a></tt>]{{end}}
 128 {{end}}
 129
 130 <hr/>
 131 <h2>{{.Title}}</h2>
 132 <pre>
 133 {{range .Lines}}{{. | lineURLize $Cfg.URLPrefix}}
 134 {{end}}</pre>
 135 <hr/>
 136
 137 {{if .NoteLines}}Note:<pre>
 138 {{range .NoteLines}}{{. | lineURLize $Cfg.URLPrefix}}
 139 {{end}}</pre>
 140 <hr/>{{end}}
 141
 142 {{if .Cfg.CommentsEmail}}[<a href="mailto:{{.Cfg.CommentsEmail}}?subject={{.TitleEscaped}}">leave comment</a>]{{end}}
 143
 144 <dl>{{range $idx, $comment := .Comments}}
 145 <dt><a name="comment{{$idx}}"><a href="#comment{{$idx}}">comment {{$idx}}</a>:</dt>
 146 <dd><pre>
 147 {{range $comment.HeaderLines}}{{.}}
 148 {{end}}{{range $comment.BodyLines}}{{. | lineURLize $Cfg.URLPrefix}}
 149 {{end}}</pre></dd>
 150 {{end}}</dl>
 151
 152 </body>
 153 </html>
 154 `
 155 )
 156
 157 var (
 158         renderableSchemes = map[string]struct{}{
 159                 "finger": {},
 160                 "ftp":    {},
 161                 "gopher": {},
 162                 "http":   {},
 163                 "https":  {},
 164                 "telnet": {},
 165         }
 166 )
 167
 168 type TableEntry struct {
 169         Commit      *object.Commit
 170         CommentsRaw []byte
 171         TopicsRaw   []byte
 172         Num         int
 173         Title       string
 174         LinesNum    int
 175         CommentsNum int
 176         DomainURLs  []string
 177         Topics      []string
 178 }
 179
 180 type CommentEntry struct {
 181         HeaderLines []string
 182         BodyLines   []string
 183 }
 184
 185 func makeA(href, text string) string {
 186         return `<a href="` + href + `">` + text + `</a>`
 187 }
 188
 189 func etagString(etag hash.Hash) string {
 190         return `"` + hex.EncodeToString(etag.Sum(nil)) + `"`
 191 }
 192
 193 func urlParse(what string) *url.URL {
 194         if u, err := url.ParseRequestURI(what); err == nil {
 195                 if _, exists := renderableSchemes[u.Scheme]; exists {
 196                         return u
 197                 }
 198         }
 199         return nil
 200 }
 201
 202 func lineURLize(urlPrefix, line string) string {
 203         cols := strings.Split(html.EscapeString(line), " ")
 204         for i, col := range cols {
 205                 if u := urlParse(col); u != nil {
 206                         cols[i] = makeA(col, col)
 207                         continue
 208                 }
 209                 cols[i] = sha1DigestRe.ReplaceAllString(col, makeA(urlPrefix+"/$1", "$1"))
 210         }
 211         return strings.Join(cols, " ")
 212 }
 213
 214 func lineURLizeInTemplate(urlPrefix, line interface{}) string {
 215         return lineURLize(urlPrefix.(string), line.(string))
 216 }
 217
 218 func startHeader(etag hash.Hash, gziped bool) string {
 219         lines := []string{
 220                 "Content-Type: text/html; charset=UTF-8",
 221                 "ETag: " + etagString(etag),
 222         }
 223         if gziped {
 224                 lines = append(lines, "Content-Encoding: gzip")
 225         }
 226         lines = append(lines, "")
 227         lines = append(lines, "")
 228         return strings.Join(lines, "\n")
 229 }
 230
 231 func makeErr(err error) {
 232         fmt.Print("Content-Type: text/plain; charset=UTF-8\n\n")
 233         fmt.Println(err)
 234         log.Fatalln(err)
 235 }
 236
 237 func checkETag(etag hash.Hash) {
 238         ifNoneMatch := os.Getenv("HTTP_IF_NONE_MATCH")
 239         if ifNoneMatch != "" && ifNoneMatch == etagString(etag) {
 240                 fmt.Printf("Status: 304\nETag: %s\n\n", ifNoneMatch)
 241                 os.Exit(0)
 242         }
 243 }
 244
 245 func bytes2uuid(b []byte) string {
 246         raw := new([16]byte)
 247         copy(raw[:], b)
 248         raw[6] = (raw[6] & 0x0F) | uint8(4<<4) // version 4
 249         return fmt.Sprintf("%x-%x-%x-%x-%x", raw[0:4], raw[4:6], raw[6:8], raw[8:10], raw[10:])
 250 }
 251
 252 type CommitIterNext interface {
 253         Next() (*object.Commit, error)
 254 }
 255
 256 func serveHTTP() {
 257         cfgPath := os.Getenv("SGBLOG_CFG")
 258         if cfgPath == "" {
 259                 log.Fatalln("SGBLOG_CFG is not set")
 260         }
 261         cfg, err := readCfg(cfgPath)
 262         if err != nil {
 263                 log.Fatalln(err)
 264         }
 265
 266         pathInfo, exists := os.LookupEnv("PATH_INFO")
 267         if !exists {
 268                 pathInfo = "/"
 269         }
 270         queryValues, err := url.ParseQuery(os.Getenv("QUERY_STRING"))
 271         if err != nil {
 272                 makeErr(err)
 273         }
 274
 275         etagHash, err := blake2b.New256(nil)
 276         if err != nil {
 277                 panic(err)
 278         }
 279         for _, s := range []string{
 280                 "SGBLOG",
 281                 sgblog.Version,
 282                 cfg.GitPath,
 283                 cfg.Branch,
 284                 cfg.Title,
 285                 cfg.URLPrefix,
 286                 cfg.AtomBaseURL,
 287                 cfg.AtomId,
 288                 cfg.AtomAuthor,
 289         } {
 290                 if _, err = etagHash.Write([]byte(s)); err != nil {
 291                         panic(err)
 292                 }
 293         }
 294         etagHashForWeb := []string{
 295                 cfg.CSS,
 296                 cfg.Webmaster,
 297                 cfg.AboutURL,
 298                 cfg.CommentsNotesRef,
 299                 cfg.CommentsEmail,
 300         }
 301         for _, gitURL := range cfg.GitURLs {
 302                 etagHashForWeb = append(etagHashForWeb, gitURL)
 303         }
 304
 305         headHash, err := initRepo(cfg)
 306         if err != nil {
 307                 makeErr(err)
 308         }
 309
 310         if notes, err := repo.Notes(); err == nil {
 311                 var notesRef *plumbing.Reference
 312                 var commentsRef *plumbing.Reference
 313                 notes.ForEach(func(ref *plumbing.Reference) error {
 314                         switch string(ref.Name()) {
 315                         case "refs/notes/commits":
 316                                 notesRef = ref
 317                         case cfg.CommentsNotesRef:
 318                                 commentsRef = ref
 319                         }
 320                         return nil
 321                 })
 322                 if notesRef != nil {
 323                         if commentsCommit, err := repo.CommitObject(notesRef.Hash()); err == nil {
 324                                 notesTree, _ = commentsCommit.Tree()
 325                         }
 326                 }
 327                 if commentsRef != nil {
 328                         if commentsCommit, err := repo.CommitObject(commentsRef.Hash()); err == nil {
 329                                 commentsTree, _ = commentsCommit.Tree()
 330                         }
 331                 }
 332         }
 333
 334         var outBuf bytes.Buffer
 335         var out io.Writer
 336         out = &outBuf
 337         var gzipWriter *gzip.Writer
 338         acceptEncoding := os.Getenv("HTTP_ACCEPT_ENCODING")
 339         for _, encoding := range strings.Split(acceptEncoding, ", ") {
 340                 if encoding == "gzip" {
 341                         gzipWriter = gzip.NewWriter(&outBuf)
 342                         out = gzipWriter
 343                 }
 344         }
 345
 346         if pathInfo == "/" {
 347                 offset := 0
 348                 if offsetRaw, exists := queryValues["offset"]; exists {
 349                         offset, err = strconv.Atoi(offsetRaw[0])
 350                         if err != nil {
 351                                 makeErr(err)
 352                         }
 353                 }
 354                 repoLog, err := repo.Log(&git.LogOptions{From: *headHash})
 355                 if err != nil {
 356                         makeErr(err)
 357                 }
 358                 topicsCache, err := getTopicsCache(cfg, repoLog)
 359                 if err != nil {
 360                         makeErr(err)
 361                 }
 362                 repoLog, err = repo.Log(&git.LogOptions{From: *headHash})
 363                 if err != nil {
 364                         makeErr(err)
 365                 }
 366
 367                 commitN := 0
 368                 var commits CommitIterNext
 369                 var topic string
 370                 if t, exists := queryValues["topic"]; exists {
 371                         topic = t[0]
 372                         hashes := topicsCache[topic]
 373                         if hashes == nil {
 374                                 makeErr(errors.New("no posts with that topic"))
 375                         }
 376                         if len(hashes) > offset {
 377                                 hashes = hashes[offset:]
 378                                 commitN += offset
 379                         }
 380                         commits = &HashesIter{hashes}
 381                 } else {
 382                         for i := 0; i < offset; i++ {
 383                                 if _, err = repoLog.Next(); err != nil {
 384                                         break
 385                                 }
 386                                 commitN++
 387                         }
 388                         commits = repoLog
 389                 }
 390
 391                 entries := make([]TableEntry, 0, PageEntries)
 392                 logEnded := false
 393                 for _, data := range etagHashForWeb {
 394                         etagHash.Write([]byte(data))
 395                 }
 396                 etagHash.Write([]byte("INDEX"))
 397                 etagHash.Write([]byte(topic))
 398                 for i := 0; i < PageEntries; i++ {
 399                         commit, err := commits.Next()
 400                         if err != nil {
 401                                 logEnded = true
 402                                 break
 403                         }
 404                         etagHash.Write(commit.Hash[:])
 405                         commentsRaw := sgblog.GetNote(repo, commentsTree, commit.Hash)
 406                         etagHash.Write(commentsRaw)
 407                         topicsRaw := sgblog.GetNote(repo, topicsTree, commit.Hash)
 408                         etagHash.Write(topicsRaw)
 409                         entries = append(entries, TableEntry{
 410                                 Commit:      commit,
 411                                 CommentsRaw: commentsRaw,
 412                                 TopicsRaw:   topicsRaw,
 413                         })
 414                 }
 415                 checkETag(etagHash)
 416
 417                 for i, entry := range entries {
 418                         commitN++
 419                         entry.Num = commitN
 420                         lines := msgSplit(entry.Commit.Message)
 421                         entry.Title = lines[0]
 422                         entry.LinesNum = len(lines) - 2
 423                         for _, line := range lines[2:] {
 424                                 u := urlParse(line)
 425                                 if u == nil {
 426                                         break
 427                                 }
 428                                 entry.DomainURLs = append(entry.DomainURLs, makeA(line, u.Host))
 429                         }
 430                         entry.CommentsNum = len(sgblog.ParseComments(entry.CommentsRaw))
 431                         entry.Topics = sgblog.ParseTopics(entry.TopicsRaw)
 432                         entries[i] = entry
 433                 }
 434                 offsetPrev := offset - PageEntries
 435                 if offsetPrev < 0 {
 436                         offsetPrev = 0
 437                 }
 438                 tmpl := template.Must(template.New("index").Parse(TmplHTMLIndex))
 439                 os.Stdout.Write([]byte(startHeader(etagHash, gzipWriter != nil)))
 440                 err = tmpl.Execute(out, struct {
 441                         Version          string
 442                         Cfg              *Cfg
 443                         Topic            string
 444                         TopicsEnabled    bool
 445                         Topics           []string
 446                         CommentsEnabled  bool
 447                         AtomPostsFeed    string
 448                         AtomCommentsFeed string
 449                         Offset           int
 450                         OffsetPrev       int
 451                         OffsetNext       int
 452                         LogEnded         bool
 453                         Entries          []TableEntry
 454                 }{
 455                         Version:          sgblog.Version,
 456                         Cfg:              cfg,
 457                         Topic:            topic,
 458                         TopicsEnabled:    topicsTree != nil,
 459                         Topics:           topicsCache.Topics(),
 460                         CommentsEnabled:  commentsTree != nil,
 461                         AtomPostsFeed:    AtomPostsFeed,
 462                         AtomCommentsFeed: AtomCommentsFeed,
 463                         Offset:           offset,
 464                         OffsetPrev:       offsetPrev,
 465                         OffsetNext:       offset + PageEntries,
 466                         LogEnded:         logEnded,
 467                         Entries:          entries,
 468                 })
 469                 if err != nil {
 470                         makeErr(err)
 471                 }
 472         } else if pathInfo == "/"+AtomPostsFeed {
 473                 commit, err := repo.CommitObject(*headHash)
 474                 if err != nil {
 475                         makeErr(err)
 476                 }
 477
 478                 var topic string
 479                 if t, exists := queryValues["topic"]; exists {
 480                         topic = t[0]
 481                 }
 482
 483                 etagHash.Write([]byte("ATOM POSTS"))
 484                 etagHash.Write([]byte(topic))
 485                 etagHash.Write(commit.Hash[:])
 486                 checkETag(etagHash)
 487                 var title string
 488                 if topic == "" {
 489                         title = cfg.Title
 490                 } else {
 491                         title = fmt.Sprintf("%s (topic: %s)", cfg.Title, topic)
 492                 }
 493                 idHasher, err := blake2b.New256(nil)
 494                 if err != nil {
 495                         panic(err)
 496                 }
 497                 idHasher.Write([]byte("ATOM POSTS"))
 498                 idHasher.Write([]byte(cfg.AtomId))
 499                 idHasher.Write([]byte(topic))
 500                 feed := atom.Feed{
 501                         Title:   title,
 502                         ID:      "urn:uuid:" + bytes2uuid(idHasher.Sum(nil)),
 503                         Updated: atom.Time(commit.Author.When),
 504                         Link: []atom.Link{{
 505                                 Rel:  "self",
 506                                 Href: cfg.AtomBaseURL + cfg.URLPrefix + "/" + AtomPostsFeed,
 507                         }},
 508                         Author: &atom.Person{Name: cfg.AtomAuthor},
 509                 }
 510
 511                 repoLog, err := repo.Log(&git.LogOptions{From: *headHash})
 512                 if err != nil {
 513                         makeErr(err)
 514                 }
 515                 var commits CommitIterNext
 516                 if topic == "" {
 517                         commits = repoLog
 518                 } else {
 519                         topicsCache, err := getTopicsCache(cfg, repoLog)
 520                         if err != nil {
 521                                 makeErr(err)
 522                         }
 523                         hashes := topicsCache[topic]
 524                         if hashes == nil {
 525                                 makeErr(errors.New("no posts with that topic"))
 526                         }
 527                         commits = &HashesIter{hashes}
 528                 }
 529
 530                 for i := 0; i < PageEntries; i++ {
 531                         commit, err = commits.Next()
 532                         if err != nil {
 533                                 break
 534                         }
 535                         lines := msgSplit(commit.Message)
 536                         var categories []atom.Category
 537                         for _, topic := range sgblog.ParseTopics(sgblog.GetNote(repo, topicsTree, commit.Hash)) {
 538                                 categories = append(categories, atom.Category{Term: topic})
 539                         }
 540                         htmlized := make([]string, 0, len(lines))
 541                         htmlized = append(htmlized, "<pre>")
 542                         for _, l := range lines[2:] {
 543                                 htmlized = append(htmlized, lineURLize(cfg.AtomBaseURL+cfg.URLPrefix, l))
 544                         }
 545                         htmlized = append(htmlized, "</pre>")
 546                         feed.Entry = append(feed.Entry, &atom.Entry{
 547                                 Title: lines[0],
 548                                 ID:    "urn:uuid:" + bytes2uuid(commit.Hash[:]),
 549                                 Link: []atom.Link{{
 550                                         Rel:  "alternate",
 551                                         Href: cfg.AtomBaseURL + cfg.URLPrefix + "/" + commit.Hash.String(),
 552                                 }},
 553                                 Published: atom.Time(commit.Author.When),
 554                                 Updated:   atom.Time(commit.Author.When),
 555                                 Summary:   &atom.Text{Type: "text", Body: lines[0]},
 556                                 Content: &atom.Text{
 557                                         Type: "html",
 558                                         Body: strings.Join(htmlized, "\n"),
 559                                 },
 560                                 Category: categories,
 561                         })
 562                 }
 563                 data, err := xml.MarshalIndent(&feed, "", "  ")
 564                 if err != nil {
 565                         makeErr(err)
 566                 }
 567                 out.Write(data)
 568                 goto AtomFinish
 569         } else if pathInfo == "/"+AtomCommentsFeed {
 570                 commit, err := repo.CommitObject(commentsRef.Hash())
 571                 if err != nil {
 572                         makeErr(err)
 573                 }
 574                 etagHash.Write([]byte("ATOM COMMENTS"))
 575                 etagHash.Write(commit.Hash[:])
 576                 checkETag(etagHash)
 577                 idHasher, err := blake2b.New256(nil)
 578                 if err != nil {
 579                         panic(err)
 580                 }
 581                 idHasher.Write([]byte("ATOM COMMENTS"))
 582                 idHasher.Write([]byte(cfg.AtomId))
 583                 feed := atom.Feed{
 584                         Title:   cfg.Title + " comments",
 585                         ID:      "urn:uuid:" + bytes2uuid(idHasher.Sum(nil)),
 586                         Updated: atom.Time(commit.Author.When),
 587                         Link: []atom.Link{{
 588                                 Rel:  "self",
 589                                 Href: cfg.AtomBaseURL + cfg.URLPrefix + "/" + AtomCommentsFeed,
 590                         }},
 591                         Author: &atom.Person{Name: cfg.AtomAuthor},
 592                 }
 593                 repoLog, err := repo.Log(&git.LogOptions{From: commentsRef.Hash()})
 594                 if err != nil {
 595                         makeErr(err)
 596                 }
 597                 for i := 0; i < PageEntries; i++ {
 598                         commit, err = repoLog.Next()
 599                         if err != nil {
 600                                 break
 601                         }
 602                         fileStats, err := commit.Stats()
 603                         if err != nil {
 604                                 makeErr(err)
 605                         }
 606                         t, err := commit.Tree()
 607                         if err != nil {
 608                                 makeErr(err)
 609                         }
 610                         commentedHash := plumbing.NewHash(strings.ReplaceAll(
 611                                 fileStats[0].Name, "/", "",
 612                         ))
 613                         commit, err = repo.CommitObject(commentedHash)
 614                         if err != nil {
 615                                 continue
 616                         }
 617                         comments := sgblog.ParseComments(sgblog.GetNote(repo, t, commentedHash))
 618                         if len(comments) == 0 {
 619                                 continue
 620                         }
 621                         commentN := strconv.Itoa(len(comments) - 1)
 622                         lines := strings.Split(comments[len(comments)-1], "\n")
 623                         from := strings.TrimPrefix(lines[0], "From: ")
 624                         date := strings.TrimPrefix(lines[1], "Date: ")
 625                         htmlized := make([]string, 0, len(lines))
 626                         htmlized = append(htmlized, "<pre>")
 627                         for _, l := range lines[2:] {
 628                                 htmlized = append(htmlized, lineURLize(cfg.AtomBaseURL+cfg.URLPrefix, l))
 629                         }
 630                         htmlized = append(htmlized, "</pre>")
 631                         idHasher.Reset()
 632                         idHasher.Write([]byte("COMMENT"))
 633                         idHasher.Write(commit.Hash[:])
 634                         idHasher.Write([]byte(commentN))
 635                         feed.Entry = append(feed.Entry, &atom.Entry{
 636                                 Title: fmt.Sprintf(
 637                                         "Comment %s for \"%s\" by %s",
 638                                         commentN, msgSplit(commit.Message)[0], from,
 639                                 ),
 640                                 Author: &atom.Person{Name: from},
 641                                 ID:     "urn:uuid:" + bytes2uuid(idHasher.Sum(nil)),
 642                                 Link: []atom.Link{{
 643                                         Rel: "alternate",
 644                                         Href: strings.Join([]string{
 645                                                 cfg.AtomBaseURL, cfg.URLPrefix, "/",
 646                                                 commit.Hash.String(), "#comment", commentN,
 647                                         }, ""),
 648                                 }},
 649                                 Published: atom.TimeStr(strings.Replace(date, " ", "T", -1)),
 650                                 Updated:   atom.TimeStr(strings.Replace(date, " ", "T", -1)),
 651                                 Content: &atom.Text{
 652                                         Type: "html",
 653                                         Body: strings.Join(htmlized, "\n"),
 654                                 },
 655                         })
 656                 }
 657                 data, err := xml.MarshalIndent(&feed, "", "  ")
 658                 if err != nil {
 659                         makeErr(err)
 660                 }
 661                 out.Write(data)
 662                 goto AtomFinish
 663         } else if sha1DigestRe.MatchString(pathInfo[1:]) {
 664                 commit, err := repo.CommitObject(plumbing.NewHash(pathInfo[1 : 1+sha1.Size*2]))
 665                 if err != nil {
 666                         makeErr(err)
 667                 }
 668                 for _, data := range etagHashForWeb {
 669                         etagHash.Write([]byte(data))
 670                 }
 671                 etagHash.Write([]byte("ENTRY"))
 672                 etagHash.Write(commit.Hash[:])
 673                 atomCommentsURL := strings.Join([]string{
 674                         cfg.AtomBaseURL, cfg.URLPrefix, "/",
 675                         commit.Hash.String(), "/", AtomCommentsFeed,
 676                 }, "")
 677                 commentsRaw := sgblog.GetNote(repo, commentsTree, commit.Hash)
 678                 etagHash.Write(commentsRaw)
 679                 topicsRaw := sgblog.GetNote(repo, topicsTree, commit.Hash)
 680                 etagHash.Write(topicsRaw)
 681                 if strings.HasSuffix(pathInfo, AtomCommentsFeed) {
 682                         etagHash.Write([]byte("ATOM COMMENTS"))
 683                         checkETag(etagHash)
 684                         type Comment struct {
 685                                 n    string
 686                                 from string
 687                                 date string
 688                                 body []string
 689                         }
 690                         commentsRaw := sgblog.ParseComments(commentsRaw)
 691                         var toSkip int
 692                         if len(commentsRaw) > PageEntries {
 693                                 toSkip = len(commentsRaw) - PageEntries
 694                         }
 695                         comments := make([]Comment, 0, len(commentsRaw)-toSkip)
 696                         for i := len(commentsRaw) - 1; i >= toSkip; i-- {
 697                                 lines := strings.Split(commentsRaw[i], "\n")
 698                                 from := strings.TrimPrefix(lines[0], "From: ")
 699                                 date := strings.TrimPrefix(lines[1], "Date: ")
 700                                 comments = append(comments, Comment{
 701                                         n:    strconv.Itoa(i),
 702                                         from: from,
 703                                         date: strings.Replace(date, " ", "T", 1),
 704                                         body: lines[3:],
 705                                 })
 706                         }
 707                         idHasher, err := blake2b.New256(nil)
 708                         if err != nil {
 709                                 panic(err)
 710                         }
 711                         idHasher.Write([]byte("ATOM COMMENTS"))
 712                         idHasher.Write(commit.Hash[:])
 713                         feed := atom.Feed{
 714                                 Title:  fmt.Sprintf("\"%s\" comments", msgSplit(commit.Message)[0]),
 715                                 ID:     "urn:uuid:" + bytes2uuid(idHasher.Sum(nil)),
 716                                 Link:   []atom.Link{{Rel: "self", Href: atomCommentsURL}},
 717                                 Author: &atom.Person{Name: cfg.AtomAuthor},
 718                         }
 719                         if len(comments) > 0 {
 720                                 feed.Updated = atom.TimeStr(comments[0].date)
 721                         } else {
 722                                 feed.Updated = atom.Time(commit.Author.When)
 723                         }
 724                         for _, comment := range comments {
 725                                 idHasher.Reset()
 726                                 idHasher.Write([]byte("COMMENT"))
 727                                 idHasher.Write(commit.Hash[:])
 728                                 idHasher.Write([]byte(comment.n))
 729                                 htmlized := make([]string, 0, len(comment.body))
 730                                 htmlized = append(htmlized, "<pre>")
 731                                 for _, l := range comment.body {
 732                                         htmlized = append(
 733                                                 htmlized,
 734                                                 lineURLize(cfg.AtomBaseURL+cfg.URLPrefix, l),
 735                                         )
 736                                 }
 737                                 htmlized = append(htmlized, "</pre>")
 738                                 feed.Entry = append(feed.Entry, &atom.Entry{
 739                                         Title:  fmt.Sprintf("Comment %s by %s", comment.n, comment.from),
 740                                         Author: &atom.Person{Name: comment.from},
 741                                         ID:     "urn:uuid:" + bytes2uuid(idHasher.Sum(nil)),
 742                                         Link: []atom.Link{{
 743                                                 Rel: "alternate",
 744                                                 Href: strings.Join([]string{
 745                                                         cfg.AtomBaseURL,
 746                                                         cfg.URLPrefix, "/",
 747                                                         commit.Hash.String(),
 748                                                         "#comment", comment.n,
 749                                                 }, ""),
 750                                         }},
 751                                         Published: atom.TimeStr(
 752                                                 strings.Replace(comment.date, " ", "T", -1),
 753                                         ),
 754                                         Updated: atom.TimeStr(
 755                                                 strings.Replace(comment.date, " ", "T", -1),
 756                                         ),
 757                                         Content: &atom.Text{
 758                                                 Type: "html",
 759                                                 Body: strings.Join(htmlized, "\n"),
 760                                         },
 761                                 })
 762                         }
 763                         data, err := xml.MarshalIndent(&feed, "", "  ")
 764                         if err != nil {
 765                                 makeErr(err)
 766                         }
 767                         out.Write(data)
 768                         goto AtomFinish
 769                 }
 770                 notesRaw := sgblog.GetNote(repo, notesTree, commit.Hash)
 771                 etagHash.Write(notesRaw)
 772                 checkETag(etagHash)
 773
 774                 lines := msgSplit(commit.Message)
 775                 title := lines[0]
 776                 when := commit.Author.When.Format(sgblog.WhenFmt)
 777                 var parent string
 778                 if len(commit.ParentHashes) > 0 {
 779                         parent = commit.ParentHashes[0].String()
 780                 }
 781                 commentsParsed := sgblog.ParseComments(commentsRaw)
 782                 comments := make([]CommentEntry, 0, len(commentsParsed))
 783                 for _, comment := range commentsParsed {
 784                         lines := strings.Split(comment, "\n")
 785                         comments = append(comments, CommentEntry{lines[:3], lines[3:]})
 786                 }
 787                 var notesLines []string
 788                 if len(notesRaw) > 0 {
 789                         notesLines = strings.Split(string(notesRaw), "\n")
 790                 }
 791
 792                 tmpl := template.New("entry")
 793                 tmpl = tmpl.Funcs(template.FuncMap{"lineURLize": lineURLizeInTemplate})
 794                 tmpl = template.Must(tmpl.Parse(TmplHTMLEntry))
 795                 os.Stdout.Write([]byte(startHeader(etagHash, gzipWriter != nil)))
 796                 err = tmpl.Execute(out, struct {
 797                         Version         string
 798                         Cfg             *Cfg
 799                         Title           string
 800                         TitleEscaped    string
 801                         When            string
 802                         AtomCommentsURL string
 803                         Parent          string
 804                         Commit          *object.Commit
 805                         Lines           []string
 806                         NoteLines       []string
 807                         Comments        []CommentEntry
 808                         Topics          []string
 809                 }{
 810                         Version:         sgblog.Version,
 811                         Cfg:             cfg,
 812                         Title:           title,
 813                         TitleEscaped:    url.PathEscape(fmt.Sprintf("Re: %s (%s)", title, commit.Hash)),
 814                         When:            when,
 815                         AtomCommentsURL: atomCommentsURL,
 816                         Parent:          parent,
 817                         Commit:          commit,
 818                         Lines:           lines[2:],
 819                         NoteLines:       notesLines,
 820                         Comments:        comments,
 821                         Topics:          sgblog.ParseTopics(topicsRaw),
 822                 })
 823                 if err != nil {
 824                         makeErr(err)
 825                 }
 826         } else {
 827                 makeErr(errors.New("unknown URL action"))
 828         }
 829         out.Write([]byte("</body></html>\n"))
 830         if gzipWriter != nil {
 831                 gzipWriter.Close()
 832         }
 833         os.Stdout.Write(outBuf.Bytes())
 834         return
 835
 836 AtomFinish:
 837         os.Stdout.WriteString("Content-Type: application/atom+xml; charset=UTF-8\n")
 838         os.Stdout.WriteString("ETag: " + etagString(etagHash) + "\n")
 839         if gzipWriter != nil {
 840                 os.Stdout.WriteString("Content-Encoding: gzip\n")
 841                 gzipWriter.Close()
 842         }
 843         os.Stdout.WriteString("\n")
 844         os.Stdout.Write(outBuf.Bytes())
 845 }