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@ -8,33 +8,40 @@ import ( |
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log "github.com/Sirupsen/logrus" |
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"github.com/matrix-org/go-neb/matrix" |
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"github.com/russross/blackfriday" |
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"html/template" |
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"io/ioutil" |
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"mime" |
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"net/http" |
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"regexp" |
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"text/template" |
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"time" |
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) |
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type slackAttachment struct { |
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Fallback string `json:"fallback"` |
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FallbackRendered template.HTML |
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Color *string `json:"color"` |
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ColorRendered template.HTMLAttr |
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Pretext string `json:"pretext"` |
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PretextRendered template.HTML |
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AuthorName *string `json:"author_name"` |
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AuthorLink *string `json:"author_link"` |
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AuthorLink template.URL `json:"author_link"` |
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AuthorIcon *string `json:"author_icon"` |
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AuthorIconURL template.URL |
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Title *string `json:"title"` |
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TitleLink *string `json:"title_link"` |
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Text string `json:"text"` |
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TextRendered template.HTML |
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MrkdwnIn []string `json:"mrkdwn_in"` |
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Ts *int64 `json:"ts"` |
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} |
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type slackMessage struct { |
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Text string `json:"text"` |
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TextRendered template.HTML |
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Username string `json:"username"` |
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Channel string `json:"channel"` |
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Mrkdwn *bool `json:"mrkdwn"` |
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@ -46,19 +53,31 @@ type slackMessage struct { |
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// We do not do this yet, since it's assumed that clients also escape the content we send them.
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var htmlTemplate, _ = template.New("htmlTemplate").Parse(` |
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<strong>@{{ .Username }}</strong> via <strong>#{{ .Channel }}</strong><br /> |
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{{ if .Text }}{{ .Text }}<br />{{ end }} |
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{{ range .Attachments }} |
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{{ if .AuthorName }} |
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{{if .AuthorLink }}<a href="{{ .AuthorLink }}">{{ end }} |
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{{ if .AuthorIcon }}{{ .AuthorIcon }}{{ end }} |
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{{ .AuthorName }} |
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{{if .AuthorLink }}</a>{{ end }} |
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{{- with (or .TextRendered .Text nil) }} |
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{{- if . }} |
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{{- . }}<br /> |
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{{- end }} |
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{{- end }} |
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{{- range .Attachments }} |
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{{- if .AuthorName }} |
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{{- if .AuthorLink }}<a href="{{ .AuthorLink }}">{{ end }} |
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{{- if .AuthorIconUrl }}<img src="{{ .AuthorIconUrl }}" />{{ end }} |
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{{- .AuthorName }} |
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{{- if .AuthorLink }}</a>{{ end }} |
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<br /> |
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{{- end }} |
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<strong> |
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<font color="{{- .ColorRendered }}">▌</font> |
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{{- if .TitleLink }} |
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<a href="{{ .TitleLink}}">{{ .Title }}</a> |
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{{- else }} |
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{{- .Title }} |
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{{- end }} |
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<br /> |
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{{ end }} |
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<strong><font color="{{ .Color }}">▌</font>{{ if .TitleLink }}<a href="{{ .TitleLink}}">{{ .Title }}</a>{{ else }}{{ .Title }}{{ end }}<br /></strong> |
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{{ if .Pretext }}{{ .Pretext }}<br />{{ end }} |
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{{ if .Text }}{{ .Text }}<br />{{ end }} |
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{{ end }} |
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</strong> |
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{{- if .Pretext }}{{ or .PretextRendered .Pretext }}<br />{{ end }} |
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{{- if .Text }}{{ or .TextRendered .Text }}<br />{{ end }} |
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{{- end }} |
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`) |
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var netClient = &http.Client{ |
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@ -80,7 +99,7 @@ func getSlackMessage(req http.Request) (message slackMessage, err error) { |
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decoder := json.NewDecoder(req.Body) |
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err = decoder.Decode(&message) |
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} else { |
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message.Text = fmt.Sprint("**Error:** unknown Content-Type `%s`", ct) |
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message.Text = fmt.Sprintf("**Error:** unknown Content-Type `%s`", ct) |
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log.Error(message.Text) |
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} |
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@ -92,7 +111,10 @@ func linkifyString(text string) string { |
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} |
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func getColor(color *string) string { |
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if color != nil { |
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if color == nil { |
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return "black" |
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} |
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// https://api.slack.com/docs/message-attachments defines these aliases
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mappedColor, ok := map[string]string{ |
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"good": "green", |
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@ -103,65 +125,85 @@ func getColor(color *string) string { |
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return mappedColor |
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} |
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return *color |
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} |
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return "black" |
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} |
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func slackMessageToHTMLMessage(message slackMessage) (html matrix.HTMLMessage, err error) { |
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processedMessage := message |
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if message.Mrkdwn == nil || *message.Mrkdwn == true { |
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text := linkifyString(message.Text) |
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processedMessage.Text = string(blackfriday.MarkdownBasic([]byte(text))) |
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// fetches an image and encodes it as a data URL
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// returns nil if fetch fails
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func fetchAndEncodeImage(url *string) (data template.URL) { |
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if url == nil { |
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return |
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} |
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for attachmentID, attachment := range message.Attachments { |
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target := &processedMessage.Attachments[attachmentID] |
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color := getColor(attachment.Color) |
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target.Color = &color |
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if attachment.AuthorIcon != nil { |
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var resp *http.Response |
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resp, err = netClient.Get(*attachment.AuthorIcon) |
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resp, err := netClient.Get(*url) |
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if err == nil { |
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body, _ := ioutil.ReadAll(resp.Body) |
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ct, _, _ := mime.ParseMediaType(resp.Header.Get("Content-Type")) |
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b64body := base64.StdEncoding.EncodeToString(body) |
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*target.AuthorIcon = fmt.Sprintf("<img src=\"data:%s;base64,%s\" />", ct, b64body) |
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} else { |
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*target.AuthorIcon = "" |
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var ( |
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body []byte |
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contentType string |
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) |
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if body, err = ioutil.ReadAll(resp.Body); err != nil { |
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return |
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} |
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if contentType, _, err = mime.ParseMediaType(resp.Header.Get("Content-Type")); err != nil { |
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return |
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} |
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base64Body := base64.StdEncoding.EncodeToString(body) |
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data = template.URL(fmt.Sprintf("data:%s;base64,%s", contentType, base64Body)) |
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} |
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return |
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} |
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func renderSlackAttachment(attachment *slackAttachment) { |
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if attachment == nil { |
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return |
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} |
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attachment.ColorRendered = template.HTMLAttr(getColor(attachment.Color)) |
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attachment.AuthorIconURL = fetchAndEncodeImage(attachment.AuthorIcon) |
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for _, fieldName := range attachment.MrkdwnIn { |
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var targetField, srcField *string |
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var ( |
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srcField *string |
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targetField *template.HTML |
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) |
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switch fieldName { |
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case "text": |
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srcField = &attachment.Text |
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targetField = &target.Text |
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break |
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targetField = &attachment.TextRendered |
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case "pretext": |
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srcField = &attachment.Pretext |
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targetField = &target.Pretext |
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break |
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targetField = &attachment.PretextRendered |
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case "fallback": |
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srcField = &attachment.Fallback |
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targetField = &attachment.FallbackRendered |
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} |
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if targetField != nil && srcField != nil { |
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value := string( |
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log.Info(targetField) |
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*targetField = template.HTML( |
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blackfriday.MarkdownBasic([]byte(linkifyString(*srcField)))) |
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targetField = &value |
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} |
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} |
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} |
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func slackMessageToHTMLMessage(message slackMessage) (html matrix.HTMLMessage, err error) { |
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text := linkifyString(message.Text) |
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if message.Mrkdwn == nil || *message.Mrkdwn == true { |
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message.TextRendered = template.HTML(blackfriday.MarkdownBasic([]byte(text))) |
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} |
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for attachmentID := range message.Attachments { |
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renderSlackAttachment(&message.Attachments[attachmentID]) |
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} |
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var buffer bytes.Buffer |
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html.MsgType = "m.text" |
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html.Format = "org.matrix.custom.html" |
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html.Body, _ = slackMessageToMarkdown(message) |
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err = htmlTemplate.ExecuteTemplate(&buffer, "htmlTemplate", processedMessage) |
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err = htmlTemplate.ExecuteTemplate(&buffer, "htmlTemplate", message) |
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html.FormattedBody = buffer.String() |
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return |
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} |
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