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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| package weixin | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "io/fs" | ||
| "mime" | ||
| "path/filepath" | ||
| "strings" | ||
| ) | ||
|
|
||
| func randomBoundary() string { | ||
| var buf [4]byte | ||
| _, err := io.ReadFull(rand.Reader, buf[:]) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return hex.EncodeToString(buf[:]) | ||
| } | ||
|
|
||
| var quoteEscaper = strings.NewReplacer("\\", "\\\\", `"`, "\\\"") | ||
|
|
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| func escapeQuotes(s string) string { | ||
| return quoteEscaper.Replace(s) | ||
| } | ||
|
|
||
| // Multipart request has the following structure: | ||
| // POST /upload HTTP/1.1 | ||
| // Other-Headers: ... | ||
| // Content-Type: multipart/form-data; boundary=$boundary | ||
| // \r\n | ||
| // --$boundary\r\n <-request body starts here | ||
| // Content-Disposition: form-data; name="field1"; filename="xyz.img"\r\n | ||
| // Content-Type: application/octet-stream\r\n | ||
| // Content-Length: 4\r\n | ||
| // \r\n | ||
| // $content\r\n | ||
| // --$boundary\r\n | ||
| // Content-Disposition: form-data; name="field2"; filename="pwd.img"\r\n | ||
| // ... | ||
| // --$boundary--\r\n | ||
| func uploadFile(fields map[string]interface{}) (reader io.Reader, contentType string, totalSize int, err error) { | ||
| boundary := randomBoundary() | ||
| contentType = fmt.Sprintf("multipart/form-data; boundary=%s", boundary) | ||
|
|
||
| parts := make([]io.Reader, 0) | ||
| CRLF := "\r\n" | ||
|
|
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| fieldBoundary := "------------------------" + boundary + CRLF | ||
|
|
||
| for k, v := range fields { | ||
| parts = append(parts, strings.NewReader(fieldBoundary)) | ||
| totalSize += len(fieldBoundary) | ||
| if v == nil { | ||
| continue | ||
| } | ||
| switch val := v.(type) { | ||
| case string: | ||
| header := fmt.Sprintf(`Content-Disposition: form-data; name="%s"`, escapeQuotes(k)) | ||
| parts = append( | ||
| parts, | ||
| strings.NewReader(header+CRLF+CRLF), | ||
| strings.NewReader(val), | ||
| strings.NewReader(CRLF), | ||
| ) | ||
| totalSize += len(header) + 2*len(CRLF) + len(val) + len(CRLF) | ||
| continue | ||
| case fs.File: | ||
| stat, _ := val.Stat() | ||
| contentType := mime.TypeByExtension(filepath.Ext(stat.Name())) | ||
| header := strings.Join([]string{ | ||
| fmt.Sprintf(`Content-Disposition: form-data; name="%s"; filename="%s"`, escapeQuotes(k), escapeQuotes(stat.Name())), | ||
| fmt.Sprintf(`Content-Type: %s`, contentType), | ||
| fmt.Sprintf(`Content-Length: %d`, stat.Size()), | ||
| }, CRLF) | ||
| parts = append( | ||
| parts, | ||
| strings.NewReader(header+CRLF+CRLF), | ||
| val, | ||
| strings.NewReader(CRLF), | ||
| ) | ||
| totalSize += len(header) + 2*len(CRLF) + int(stat.Size()) + len(CRLF) | ||
| continue | ||
| } | ||
| } | ||
|
|
||
| finishBoundary := "------------------------" + boundary + "------------------------" + CRLF | ||
| parts = append(parts, strings.NewReader(finishBoundary)) | ||
| totalSize += len(finishBoundary) | ||
|
|
||
| return io.MultiReader(parts...), contentType, totalSize, nil | ||
| } |
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