109 lines
2.8 KiB
Go
109 lines
2.8 KiB
Go
package notify
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import (
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"context"
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"errors"
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"fmt"
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"net/url"
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"strings"
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"github.com/slack-go/slack"
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)
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// Slack notifications client
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type Slack struct {
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client *slack.Client
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}
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// NewSlack makes Slack client for notifications
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func NewSlack(token string, opts ...slack.Option) *Slack {
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return &Slack{client: slack.New(token, opts...)}
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}
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// Send sends the message over Slack, with "title", "titleLink" and "attachmentText" parsed from destination field
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// with "slack:" schema same way "mailto:" schema is constructed.
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//
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// Example:
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//
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// - slack:channelName
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// - slack:channelID
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// - slack:userID
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// - slack:channel?title=title&attachmentText=test%20text&titleLink=https://example.org
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func (s *Slack) Send(ctx context.Context, destination, text string) error {
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channelID, attachment, err := s.parseDestination(destination)
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if err != nil {
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return fmt.Errorf("problem parsing destination: %w", err)
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}
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options := []slack.MsgOption{slack.MsgOptionText(text, false)}
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if attachment.Title != "" {
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options = append(options, slack.MsgOptionAttachments(attachment))
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}
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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_, _, err = s.client.PostMessageContext(ctx, channelID, options...)
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return err
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}
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}
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// Schema returns schema prefix supported by this client
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func (s *Slack) Schema() string {
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return "slack"
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}
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func (s *Slack) String() string {
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return "slack notifications destination"
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}
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// parses "slack:" in a manner "mailto:" URL is parsed url and returns channelID and attachment.
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// if channelID is channel name and not ID (starting with C for channel and with U for user),
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// then it will be resolved to ID.
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func (s *Slack) parseDestination(destination string) (string, slack.Attachment, error) {
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// parse URL
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u, err := url.Parse(destination)
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if err != nil {
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return "", slack.Attachment{}, err
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}
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if u.Scheme != "slack" {
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return "", slack.Attachment{}, fmt.Errorf("unsupported scheme %s, should be slack", u.Scheme)
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}
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channelID := u.Opaque
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if !strings.HasPrefix(u.Opaque, "C") && !strings.HasPrefix(u.Opaque, "U") {
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channelID, err = s.findChannelIDByName(u.Opaque)
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if err != nil {
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return "", slack.Attachment{}, fmt.Errorf("problem retrieving channel ID for #%s: %w", u.Opaque, err)
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}
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}
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return channelID,
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slack.Attachment{
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Title: u.Query().Get("title"),
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TitleLink: u.Query().Get("titleLink"),
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Text: u.Query().Get("attachmentText"),
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}, nil
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}
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func (s *Slack) findChannelIDByName(name string) (string, error) {
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params := slack.GetConversationsParameters{}
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for {
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channels, next, err := s.client.GetConversations(¶ms)
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if err != nil {
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return "", err
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}
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for _, channel := range channels {
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if channel.Name == name {
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return channel.ID, nil
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}
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}
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if next == "" {
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break
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}
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params.Cursor = next
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}
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return "", errors.New("no such channel")
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}
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