added plaintext fallback for markdown

src/service/telegram/index.ts

@@ -73,10 +73,14 @@ export class TelegramService {
   public sendMessageToChan = async (
     channel: string,
     message: string,
+    markdown?: boolean,
     extra?: ExtraReplyMessage
   ) => {
     logger.debug(`sending message "${message}" to chan "${channel}"`);
-    return await this.bot.telegram.sendMessage(channel, message, extra);
+    return await this.bot.telegram.sendMessage(channel, message, {
+      ...extra,
+      ...(markdown ? { parse_mode: "Markdown" } : {}),
+    });
   };
 
   /**
@@ -86,12 +90,14 @@ export class TelegramService {
     channel: string,
     caption: string,
     src: string,
+    markdown?: boolean,
     extra?: ExtraReplyMessage
   ) => {
     logger.debug(`sending photo message "${caption}" to chan "${channel}"`);
     return await this.bot.telegram.sendPhoto(channel, src, {
       ...extra,
       caption,
+      ...(markdown ? { parse_mode: "Markdown" } : {}),
     });
   };
 

src/service/template/index.ts

@@ -8,6 +8,7 @@ import toVFile from "to-vfile";
 import path from "path";
 import hb from "handlebars";
 import strip from "strip-markdown";
+import { VFileCompatible } from "vfile";
 
 const removeFrontmatter = () => (tree) => {
   tree.children = tree.children.filter((item) => item.type !== "yaml");
@@ -20,25 +21,26 @@ export class Template<
   public fields: F = {} as F;
   public template: string = "";
 
+  private readonly file: VFileCompatible = "";
+
   constructor(filename: string) {
     try {
       if (!filename) {
         return;
       }
 
+      // read file and fields from it to this.fields
+
       const processor = unified()
         .use(stringify)
         .use(frontmatter)
         .use(extract, { yaml: parse })
         .use(removeFrontmatter)
-        .use(parser)
-        .use(strip);
-
-      const file = toVFile.readSync(path.join(__dirname, "../../", filename));
-      const result = processor.processSync(file);
+        .use(parser);
 
+      this.file = toVFile.readSync(path.join(__dirname, "../../", filename));
+      const result = processor.processSync(this.file);
       this.fields = result.data as F;
-      this.template = result.contents.toString().trim();
     } catch (e) {
       throw new Error(`Template: ${e.toString()}`);
     }
@@ -47,8 +49,23 @@ export class Template<
   /**
    * Themes the template with values
    */
-  public theme = (values: V) => {
-    return hb.compile(this.template)(values).replace(/\n+/g, "\n\n");
+  public theme = (values: V, markdown?: boolean) => {
+    const processor = unified()
+      .use(stringify)
+      .use(frontmatter)
+      .use(removeFrontmatter)
+      .use(parser);
+
+    if (!markdown) {
+      processor.use(strip);
+    }
+
+    const result = processor.processSync(this.file);
+    const template = result.contents.toString().trim();
+
+    return hb
+      .compile(template)(values)
+      .replace(/\n{2,}/g, "\n\n");
   };
 
   /**
@@ -62,15 +79,12 @@ export class Template<
   }
 
   public static cleanText(text: string) {
-    const processor = unified()
+    return unified()
       .use(stringify)
-      .use(frontmatter)
-      .use(extract, { yaml: parse })
-      .use(removeFrontmatter)
       .use(parser)
-      .use(strip);
-
-    return processor.processSync(text).contents.toString();
+      .use(strip)
+      .processSync(text)
+      .contents.toString();
   }
 }
 

src/service/vk/handlers/JoinLeaveHandler.ts

@@ -29,20 +29,27 @@ export class JoinLeaveHandler extends VkEventHandler<Fields, Values> {
       `vk, group ${this.group.name}: ${user.first_name} ${user.last_name} ${dir} the group`
     );
 
-    const parsed = this.template.theme({
+    const parsed = this.template.theme(
+      {
         user,
         group: this.group,
         isJoined: context.isJoin,
         isLeave: context.isLeave,
         count,
-    });
+      },
+      !!this.channel.markdown
+    );
 
     const extras: ExtraReplyMessage = {
-      parse_mode: "Markdown",
       disable_web_page_preview: true,
     };
 
-    await this.telegram.sendMessageToChan(this.channel.id, parsed, extras);
+    await this.telegram.sendMessageToChan(
+      this.channel.id,
+      parsed,
+      !!this.channel.markdown,
+      extras
+    );
 
     await next();
   };

src/service/vk/handlers/MessageNewHandler.ts

@@ -34,20 +34,27 @@ export class MessageNewHandler extends VkEventHandler<Fields, Values> {
       `vk, group ${this.group.name} received message from ${user.first_name} ${user.last_name}: "${context.text}"`
     );
 
-    const parsed = this.template.theme({
+    const parsed = this.template.theme(
+      {
         user,
         group: this.group,
         text: context?.text || "",
-    });
+      },
+      !!this.channel.markdown
+    );
 
     const extras: ExtraReplyMessage = {
-      parse_mode: "Markdown",
       disable_web_page_preview: true,
     };
 
     this.appendButtons(extras, user.id);
 
-    await this.telegram.sendMessageToChan(this.channel.id, parsed, extras);
+    await this.telegram.sendMessageToChan(
+      this.channel.id,
+      parsed,
+      !!this.channel.markdown,
+      extras
+    );
 
     await next();
   };

src/service/vk/handlers/PostNewHandler.ts

@@ -100,33 +100,20 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
       reply_markup: await this.createKeyboard(text, undefined, context.wall.id),
     };
 
-    let msg: Message | PhotoMessage;
-
     const images = context.wall.getAttachments("photo");
     const thumbs = images
       .map(getAttachment)
       .filter((el) => el)
       .slice(0, this.template.fields.images_limit) as string[];
 
-    const hasThumb =
-      !!this.template.fields.image &&
-      !!this.template.fields.images_limit &&
-      thumbs.length > 0;
-
-    if (hasThumb) {
-      msg = await this.telegram.sendPhotoToChan(
-        this.channel.id,
-        this.trimTextForPhoto(text, PHOTO_CAPTION_LIMIT, postType, user),
-        thumbs[0]!,
-        extras
+    const msg = await this.sendMessage(
+      text,
+      thumbs,
+      extras,
+      postType,
+      user,
+      this.channel.markdown
     );
-    } else {
-      msg = await this.telegram.sendMessageToChan(
-        this.channel.id,
-        this.trimTextForPhoto(text, POST_TEXT_LIMIT, postType, user),
-        extras
-      );
-    }
 
     const event = await this.createEvent(
       id,
@@ -380,14 +367,18 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
   private themeText = (
     text: string,
     type?: string,
-    user?: UsersUserFull
+    user?: UsersUserFull,
+    markdown?: boolean
   ): string => {
-    return this.template.theme({
+    return this.template.theme(
+      {
         user,
         group: this.group,
         type,
         text: Template.cleanText(text),
-    });
+      },
+      markdown
+    );
   };
 
   /**
@@ -397,9 +388,10 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
     text: string,
     maxChars: number,
     type?: string,
-    user?: UsersUserFull
+    user?: UsersUserFull,
+    markdown?: boolean
   ): string => {
-    const withText = this.themeText(text, type, user);
+    const withText = this.themeText(text, type, user, markdown);
     const limit = this.template.fields.char_limit
       ? Math.min(this.template.fields.char_limit, maxChars)
       : maxChars;
@@ -408,13 +400,11 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
       return withText;
     }
 
-    const withoutText = this.themeText("", type, user);
+    const withoutText = this.themeText("", type, user, markdown);
     const suffix = "...";
     const trimmed = text.slice(0, limit - withoutText.length - suffix.length);
 
-    const txt = this.themeText(`${trimmed}${suffix}`, type, user);
-
-    return txt;
+    return this.themeText(`${trimmed}${suffix}`, type, user, markdown);
   };
 
   /**
@@ -431,4 +421,69 @@ export class PostNewHandler extends VkEventHandler<Fields, Values> {
       .filter((el) => el)
       .join(" ")
       .trim() || "someone";
+
+  /**
+   * Sends message
+   */
+  sendMessage = async (
+    text: string,
+    thumbs: string[],
+    extras?: ExtraReplyMessage,
+    postType?: string,
+    user?: UsersUserFull,
+    markdown?: boolean
+  ) => {
+    try {
+      const hasThumb =
+        !!this.template.fields.image &&
+        !!this.template.fields.images_limit &&
+        thumbs.length > 0;
+
+      if (hasThumb) {
+        const trimmed = this.trimTextForPhoto(
+          text,
+          PHOTO_CAPTION_LIMIT,
+          postType,
+          user,
+          markdown
+        );
+
+        return await this.telegram.sendPhotoToChan(
+          this.channel.id,
+          trimmed,
+          thumbs[0]!,
+          markdown,
+          extras
+        );
+      } else {
+        const trimmed = this.trimTextForPhoto(
+          text,
+          POST_TEXT_LIMIT,
+          postType,
+          user,
+          markdown
+        );
+
+        return await this.telegram.sendMessageToChan(
+          this.channel.id,
+          trimmed,
+          markdown,
+          extras
+        );
+      }
+    } catch (e) {
+      if (!markdown) {
+        throw e;
+      }
+
+      // Try to send as plain text
+
+      logger.warn(
+        `telegram: failed to send markdown, falling back to plaintext: ${e}`,
+        e
+      );
+
+      return this.sendMessage(text, thumbs, extras, postType, user, false);
+    }
+  };
 }

src/service/vk/types.ts

@@ -22,6 +22,7 @@ export interface GroupChannel {
   events: VkEvent[];
   post_types: WallPostType[];
   templates: Partial<TemplateConfig>;
+  markdown?: boolean;
 }
 
 export enum VkEvent {

src/service/vk/validation.ts

@@ -14,6 +14,7 @@ const vkChannelSchema = yup
       .matches(/^@/, ({ path }) => `${path} should start with "@"`),
     events: yup.array().of(vkChannelEventSchema),
     templates: templateOptionalSchema,
+    markdown: yup.boolean().optional(),
   });
 
 export const vkConfigSchema = yup

templates/post_new.md

@@ -19,5 +19,7 @@
      
 --}}
 {{#ifEq type 'suggest'}}Предложка:{{/ifEq}}
-{{text}}
-{{#if user}}[{{user.first_name}} {{user.last_name}}](https://vk.com/id{{user.id}}){{/if}}
+
+{{{text}}}
+{{#if user}}
+— [{{user.first_name}} {{user.last_name}}](https://vk.com/id{{user.id}}){{/if}}