| 1 | package bdiscord |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "strings" |
| 6 | |
| 7 | "github.com/bwmarrin/discordgo" |
| 8 | "github.com/matterbridge-org/matterbridge/bridge/config" |
| 9 | "github.com/matterbridge-org/matterbridge/bridge/helper" |
| 10 | ) |
| 11 | |
| 12 | // shouldMessageUseWebhooks checks if have a channel specific webhook, if we're not using auto webhooks |
| 13 | func (b *Bdiscord) shouldMessageUseWebhooks(msg *config.Message) bool { |
| 14 | if b.useAutoWebhooks { |
| 15 | return true |
| 16 | } |
| 17 | |
| 18 | b.channelsMutex.RLock() |
| 19 | defer b.channelsMutex.RUnlock() |
| 20 | if ci, ok := b.channelInfoMap[msg.Channel+b.Account]; ok { |
| 21 | if ci.Options.WebhookURL != "" { |
| 22 | return true |
| 23 | } |
| 24 | } |
| 25 | return false |
| 26 | } |
| 27 | |
| 28 | // maybeGetLocalAvatar checks if UseLocalAvatar contains the message's |
| 29 | // account or protocol, and if so, returns the Discord avatar (if exists) |
| 30 | func (b *Bdiscord) maybeGetLocalAvatar(msg *config.Message) string { |
| 31 | for _, val := range b.GetStringSlice("UseLocalAvatar") { |
| 32 | if msg.Protocol != val && msg.Account != val { |
| 33 | continue |
| 34 | } |
| 35 | |
| 36 | member, err := b.getGuildMemberByNick(msg.Username) |
| 37 | if err != nil { |
| 38 | return "" |
| 39 | } |
| 40 | |
| 41 | return member.User.AvatarURL("") |
| 42 | } |
| 43 | return "" |
| 44 | } |
| 45 | |
| 46 | func (b *Bdiscord) webhookSendTextOnly(msg *config.Message, channelID string) (string, error) { |
| 47 | msgParts := helper.ClipOrSplitMessage(msg.Text, MessageLength, b.GetString("MessageClipped"), b.GetInt("MessageSplitMaxCount")) |
| 48 | msgIds := []string{} |
| 49 | for _, msgPart := range msgParts { |
| 50 | res, err := b.transmitter.Send( |
| 51 | channelID, |
| 52 | &discordgo.WebhookParams{ |
| 53 | Content: msgPart, |
| 54 | Username: msg.Username, |
| 55 | AvatarURL: msg.Avatar, |
| 56 | AllowedMentions: b.getAllowedMentions(), |
| 57 | }, |
| 58 | ) |
| 59 | if err != nil { |
| 60 | return "", err |
| 61 | } else { |
| 62 | msgIds = append(msgIds, res.ID) |
| 63 | } |
| 64 | } |
| 65 | // Exploit that a discord message ID is actually just a large number, so we encode a list of IDs by separating them with ";". |
| 66 | return strings.Join(msgIds, ";"), nil |
| 67 | } |
| 68 | |
| 69 | func (b *Bdiscord) webhookSendFilesOnly(msg *config.Message, channelID string) error { |
| 70 | for _, f := range msg.Extra["file"] { |
| 71 | fi := f.(config.FileInfo) //nolint:forcetypeassert |
| 72 | file := discordgo.File{ |
| 73 | Name: fi.Name, |
| 74 | ContentType: "", |
| 75 | Reader: bytes.NewReader(*fi.Data), |
| 76 | } |
| 77 | content := fi.Comment |
| 78 | |
| 79 | // Cannot use the resulting ID for any edits anyway, so throw it away. |
| 80 | // This has to be re-enabled when we implement message deletion. |
| 81 | _, err := b.transmitter.Send( |
| 82 | channelID, |
| 83 | &discordgo.WebhookParams{ |
| 84 | Username: msg.Username, |
| 85 | AvatarURL: msg.Avatar, |
| 86 | Files: []*discordgo.File{&file}, |
| 87 | Content: content, |
| 88 | AllowedMentions: b.getAllowedMentions(), |
| 89 | }, |
| 90 | ) |
| 91 | if err != nil { |
| 92 | b.Log.Errorf("Could not send file %#v for message %#v: %s", file, msg, err) |
| 93 | return err |
| 94 | } |
| 95 | } |
| 96 | return nil |
| 97 | } |
| 98 | |
| 99 | // webhookSend send one or more message via webhook, taking care of file |
| 100 | // uploads (from slack, telegram or mattermost). |
| 101 | // Returns messageID and error. |
| 102 | func (b *Bdiscord) webhookSend(msg *config.Message, channelID string) (string, error) { |
| 103 | var ( |
| 104 | res string |
| 105 | err error |
| 106 | ) |
| 107 | |
| 108 | // If avatar is unset, mutate the message to include the local avatar (but only if settings say we should do this) |
| 109 | if msg.Avatar == "" { |
| 110 | msg.Avatar = b.maybeGetLocalAvatar(msg) |
| 111 | } |
| 112 | |
| 113 | // WebhookParams can have either `Content` or `File`. |
| 114 | |
| 115 | // We can't send empty messages. |
| 116 | if msg.Text != "" { |
| 117 | res, err = b.webhookSendTextOnly(msg, channelID) |
| 118 | } |
| 119 | |
| 120 | if err == nil && msg.Extra != nil { |
| 121 | err = b.webhookSendFilesOnly(msg, channelID) |
| 122 | } |
| 123 | |
| 124 | return res, err |
| 125 | } |
| 126 | |
| 127 | func (b *Bdiscord) handleEventWebhook(msg *config.Message, channelID string) (string, error) { |
| 128 | // skip events |
| 129 | if msg.Event != "" && msg.Event != config.EventUserAction && msg.Event != config.EventJoinLeave && msg.Event != config.EventTopicChange { |
| 130 | return "", nil |
| 131 | } |
| 132 | |
| 133 | // skip empty messages |
| 134 | if msg.Text == "" && (msg.Extra == nil || len(msg.Extra["file"]) == 0) { |
| 135 | b.Log.Debugf("Skipping empty message %#v", msg) |
| 136 | return "", nil |
| 137 | } |
| 138 | |
| 139 | // discord username must be [0..32] max |
| 140 | if len(msg.Username) > 32 { |
| 141 | msg.Username = msg.Username[0:32] |
| 142 | } |
| 143 | |
| 144 | if msg.ID != "" { |
| 145 | // Exploit that a discord message ID is actually just a large number, and we encode a list of IDs by separating them with ";". |
| 146 | msgIds := strings.Split(msg.ID, ";") |
| 147 | msgParts := helper.ClipOrSplitMessage(b.replaceUserMentions(msg.Text), MessageLength, b.GetString("MessageClipped"), len(msgIds)) |
| 148 | for len(msgParts) < len(msgIds) { |
| 149 | msgParts = append(msgParts, "((obsoleted by edit))") |
| 150 | } |
| 151 | b.Log.Debugf("Editing webhook message") |
| 152 | var editErr error = nil |
| 153 | for i := range msgParts { |
| 154 | // In case of split-messages where some parts remain the same (i.e. only a typo-fix in a huge message), this causes some noop-updates. |
| 155 | // TODO: Optimize away noop-updates of un-edited messages |
| 156 | editErr = b.transmitter.Edit(channelID, msgIds[i], &discordgo.WebhookParams{ |
| 157 | Content: msgParts[i], |
| 158 | Username: msg.Username, |
| 159 | AllowedMentions: b.getAllowedMentions(), |
| 160 | }) |
| 161 | if editErr != nil { |
| 162 | break |
| 163 | } |
| 164 | } |
| 165 | if editErr == nil { |
| 166 | return msg.ID, nil |
| 167 | } |
| 168 | b.Log.Errorf("Could not edit webhook message(s): %s; sending as new message(s) instead", editErr) |
| 169 | } |
| 170 | |
| 171 | b.Log.Debugf("Processing webhook sending for message %#v", msg) |
| 172 | msg.Text = b.replaceUserMentions(msg.Text) |
| 173 | msgID, err := b.webhookSend(msg, channelID) |
| 174 | if err != nil { |
| 175 | b.Log.Errorf("Could not broadcast via webhook for message %#v: %s", msgID, err) |
| 176 | return "", err |
| 177 | } |
| 178 | return msgID, nil |
| 179 | } |
| 180 | |
