Initial

diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+mattermost-server
+mmfileget
+vendor

diff --git a/COPYING b/COPYING
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+++ b/COPYING
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+Public domain

diff --git a/INSTALL b/INSTALL
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+++ b/INSTALL
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+Mattermost requires Go 1.13+.
+Not all mattermost-server's dependencies work with go modules,
+so we use their vendored versions.

diff --git a/Makefile b/Makefile
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+GO ?= go
+
+all: mmfileget
+
+mmfileget: main.go mattermost-server vendor
+       $(GO) build -mod=vendor
+
+mattermost-server:
+       git clone --depth 1 --branch v5.11.1 https://github.com/mattermost/mattermost-server.git
+
+vendor: mattermost-server
+       ln -s mattermost-server/vendor
+       ln -s $(PWD)/mattermost-server vendor/github.com/mattermost/mattermost-server

diff --git a/README b/README
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+Utility for downloading files from Mattermost.
+
+Mattermost (MM) gives URLs for file downloading like
+https://MACHINE/api/v4/files/FILE
+and you can not download it with simple fetch/curl/wget.
+That utility uses MM's API to download it.
+
+    $ mmfileget https://MACHINE/api/v4/files/FILE
+    Name: Some filename.jpg
+    Type: image/jpeg
+    Size: 43713
+    Download? Ctrl-D/C
+
+Press Ctrl-D to allow file download under provided name.
+Press Ctrl-C to quit program.
+
+    $ mmfileget https://MACHINE/api/v4/files/FILE TARGET-NAME
+
+will download file and save it in TARGET-NAME file.
+
+It uses ~/.netrc file (single line per machine format) for finding
+authentication credentials for MACHINE. You can override it with NETRC
+environment variable.

diff --git a/go.mod b/go.mod
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+++ b/go.mod
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+module go.stargrave.org/mmfileget
+
+go 1.13
+
+require github.com/mattermost/mattermost-server v5.11.1+incompatible
+
+replace github.com/mattermost/mattermost-server v5.11.1+incompatible => ./mattermost-server

diff --git a/main.go b/main.go
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+++ b/main.go
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+package main
+
+import (
+       "fmt"
+       "io/ioutil"
+       "os"
+       "path/filepath"
+       "strings"
+
+       "github.com/mattermost/mattermost-server/model"
+)
+
+func main() {
+       url := os.Args[1] // https://MACHINE/api/v4/files/FILE
+       s := strings.Split(url, "/")
+       machine, fileId := s[2], s[6]
+
+       netrcPath, ok := os.LookupEnv("NETRC")
+       if !ok {
+               netrcPath = filepath.Join(os.Getenv("HOME"), ".netrc")
+       }
+       data, err := ioutil.ReadFile(netrcPath)
+       if err != nil {
+               panic(err)
+       }
+       var login string
+       var password string
+       for _, line := range strings.Split(string(data), "\n") {
+               if i := strings.Index(line, "#"); i >= 0 {
+                       line = line[:i]
+               }
+               f := strings.Fields(line)
+               if len(f) >= 6 &&
+                       f[0] == "machine" && f[1] == machine &&
+                       f[2] == "login" && f[4] == "password" {
+                       login, password = f[3], f[5]
+                       break
+               }
+       }
+       if login == "" || password == "" {
+               fmt.Fprintln(os.Stderr, "No credentials found for:", machine)
+               os.Exit(1)
+       }
+
+       Client := model.NewAPIv4Client("https://" + machine)
+       Client.Login(login, password)
+       info, _ := Client.GetFileInfo(fileId)
+       if info == nil {
+               os.Exit(1)
+       }
+       filename := info.Name
+       if len(os.Args) > 2 {
+               filename = os.Args[2]
+       } else {
+               fmt.Fprintln(os.Stderr, "Name:", info.Name)
+               fmt.Fprintln(os.Stderr, "Type:", info.MimeType)
+               fmt.Fprintln(os.Stderr, "Size:", info.Size)
+               fmt.Fprintln(os.Stderr, "Download? Ctrl-D/C")
+               os.Stdin.Read(make([]byte, 1))
+       }
+       data, _ = Client.GetFile(fileId)
+       if err = ioutil.WriteFile(filename, data, os.FileMode(0666)); err != nil {
+               panic(err)
+       }
+}