func main() {
help := flag.Bool("help", false, "Show this help")
file := flag.String("file", "", "A file to calculate the uuid for")
base := flag.String("base", "cmbr://image/", "The base URI for the entity")
port := flag.Int("port", 0, "A port to listen for image requests on")
flag.Parse()
if *help {
flag.PrintDefaults()
return
}
baseURL, err := url.Parse(*base)
if err != nil {
log.Fatalf("Could not parse the base URI %q: %s", *base, err)
}
var reader io.Reader
if *file != "" {
fileReader, err := os.Open(*file)
if err != nil {
log.Fatalf("Could not open the specified file %q for reading: %s", *file, err)
}
defer fileReader.Close()
reader = fileReader
}
stat, _ := os.Stdin.Stat()
if (stat.Mode() & os.ModeCharDevice) == 0 {
reader = os.Stdin
}
if reader != nil {
enc := json.NewEncoder(os.Stdout)
res, err := getFileInfo(baseURL, reader)
if err != nil {
log.Fatalf("Failed to get file info: %s", err)
}
err = enc.Encode(res)
if err != nil {
log.Fatalf("Failed to encode result: %s", err)
}
}
if *port != 0 {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
enc := json.NewEncoder(w)
w.Header().Add("Content-type", "application/json")
results := make(map[string]interface{})
reader, err := r.MultipartReader()
if err != nil {
badRequest(w, err.Error())
return
}
for {
part, err := reader.NextPart()
if err == io.EOF {
break
}
if err != nil {
badRequest(w, err.Error())
return
}
if len(part.Header["Content-Disposition"]) == 0 {
badRequest(w, "Missing Content-Disposition header in multipart part")
return
}
_, params, err := mime.ParseMediaType(part.Header["Content-Disposition"][0])
if err != nil {
badRequest(w, "Failed to parse Content-Disposition %q", part.Header["Content-Disposition"][0])
return
}
fieldName, ok := params["name"]
if !ok {
badRequest(w, "Missing Content-Disposition name in %q", part.Header["Content-Disposition"][0])
return
}
res, err := getFileInfo(baseURL, part)
if err != nil {
results[fieldName] = map[string]interface{}{
"error": err.Error(),
}
log.Printf("Failed to get file info: %s", err)
} else {
results[fieldName] = res
}
}
w.WriteHeader(http.StatusOK)
enc.Encode(results)
})
log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", *port), nil))
}
}
// decodeBody parses body of a message, filling m.Body, m.HTML and m.Parts.
func (m *Message) decodeBody(r io.Reader, h textproto.MIMEHeader) error {
cth := h.Get("Content-Type")
if cth == "" {
cth = "text/plain"
}
ct, ctp, err := mime.ParseMediaType(cth)
if err != nil {
return fmt.Errorf("invalid content-type: %q", cth)
}
// Find name.
filename := ctp["name"]
if filename == "" {
cdh := h.Get("Content-Disposition")
if cdh != "" {
_, cdp, err := mime.ParseMediaType(cdh)
if err != nil {
return fmt.Errorf("invalid content-disposition: %q", cdh)
}
filename = cdp["filename"]
}
}
// If it has filename, add as attachment.
if filename != "" {
name, err := decodeHeader(filename)
if err != nil {
return fmt.Errorf("decode filename: %v", err)
}
data, err := ioutil.ReadAll(decodeTransfer(r, h.Get("Content-Transfer-Encoding")))
if err != nil {
return fmt.Errorf("read attachment: %v", err)
}
m.Parts = append(m.Parts, Part{Name: name, Data: data})
return nil
}
if ct == "text/plain" || ct == "text/html" {
buf := new(bytes.Buffer)
for {
data, err := ioutil.ReadAll(decodeTransfer(r, h.Get("Content-Transfer-Encoding")))
buf.Write(data)
if err != nil {
if _, ok := err.(base64.CorruptInputError); ok {
continue
}
return fmt.Errorf("read body: %v", err)
}
break
}
body, err := decodeCharset(buf.String(), ctp["charset"])
if err != nil {
return fmt.Errorf("charsetDecode: %v", err)
}
if ct == "text/html" {
m.HTML += body
return nil
}
m.Body += body
return nil
}
if strings.HasPrefix(ct, "multipart/") {
r := multipart.NewReader(r, ctp["boundary"])
for {
p, err := r.NextPart()
if err != nil {
if err == io.EOF {
break
}
return fmt.Errorf("next part: %q", err)
}
if err := m.decodeBody(p, p.Header); err != nil {
p.Close() // p.Close is also called automatically by r.NextPart.
return err
}
}
return nil
}
// TODO: decide what to do with this.
//return fmt.Errorf("content-type without filename: %q", ct)
return nil
}