@@ -0,0 +1,1 @@
+TELEGRAM_BOT_TOKEN=your:token_here

@@ -0,0 +1,48 @@
+#
+name: Create and publish a Docker image
+
+# Configures this workflow to run every time a change is pushed to the branch called `main`.
+on:
+  push:
+    branches: ['main']
+
+# Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+# There is a single job in this workflow. It's configured to run on the latest available version of Ubuntu.
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
+    permissions:
+      contents: read
+      packages: write
+      # 
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
+      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
+      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

@@ -0,0 +1,1 @@
+.env

@@ -0,0 +1,3 @@
+[submodule "telegram-bot-api"]
+	path = telegram-bot-api
+	url = https://github.com/OvyFlash/telegram-bot-api

@@ -0,0 +1,36 @@
+# syntax=docker/dockerfile:1
+
+FROM golang:alpine AS builder
+
+WORKDIR /build
+
+# Download Go modules
+COPY ./telegram-bot-api ./telegram-bot-api
+COPY go.mod go.su[m] ./
+RUN go mod download
+
+# Transfer source code
+
+
+COPY *.go ./
+
+# Build
+RUN CGO_ENABLED=0 go build -trimpath -o /dist/app
+
+# Test
+FROM build-stage AS run-test-stage
+RUN go test -v ./...
+
+FROM alpine:latest AS build-release-stage
+
+RUN apk update && \
+    apk add --no-cache \
+    pandoc \
+    tectonic
+
+#COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /dist /app
+
+WORKDIR /app
+
+ENTRYPOINT ["/app/app"]

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Marco Andronaco
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

@@ -0,0 +1,14 @@
+# Variables
+ENV_FILE=.env
+
+.PHONY: all clean build
+
+all: build
+
+# Build the Docker image
+build: $(REQUIREMENTS)
+	docker-compose build
+
+# Utility target to run the Docker container
+run: $(ENV_FILE)
+	docker-compose up

@@ -0,0 +1,25 @@
+# Albus
+A Telegram Bot that converts documents to more readable formats.
+
+## Usage
+
+```
+git submodule init
+git submodule update
+cp .env.example .env
+```
+
+Put your Telegram Bot Token inside `.env`.
+
+### Docker
+```
+make
+make run
+```
+
+### Poetry
+Ensure `pandoc` and `tectonic` are installed.
+
+```
+go run .
+```

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"os"
+
+	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
+	"github.com/joho/godotenv"
+)
+
+const tokenEnvName = "TELEGRAM_BOT_TOKEN"
+
+func main() {
+	godotenv.Load()
+
+	tgToken := os.Getenv(tokenEnvName)
+	if tgToken == "" {
+		println("Please set the", tokenEnvName, "environment variable.")
+		os.Exit(1)
+	}
+
+	bot, err := tgbotapi.NewBotAPI(tgToken)
+	if err != nil {
+		println(err)
+		os.Exit(1)
+	}
+
+	bot.Debug = true
+
+	println("Authorized on account", bot.Self.UserName)
+
+	u := tgbotapi.NewUpdate(0)
+	u.Timeout = 60
+
+	updates := bot.GetUpdatesChan(u)
+
+	for update := range updates {
+		if update.Message == nil { // ignore any non-Message updates
+			continue
+		}
+
+		msg := tgbotapi.NewMessage(update.Message.Chat.ID, "")
+		msg.ReplyParameters.MessageID = update.Message.MessageID
+
+		messageDocument := update.Message.Document
+		if messageDocument == nil {
+			continue
+		}
+
+		msgFileNameFull := messageDocument.FileName
+		msgFileId := messageDocument.FileID
+
+		msgFile, err := bot.GetFile(tgbotapi.FileConfig{FileID: msgFileId})
+		if err != nil {
+			println("Error getting file:", err)
+			continue
+		}
+
+		msgFileName, msgFileExtension := SplitFilename(msgFileNameFull)
+		uniqueFileName := msgFileId + msgFileExtension
+
+		err = DownloadFile(uniqueFileName, msgFile.Link(bot.Token))
+		if err != nil {
+			println("Error downloading file:", err)
+			continue
+		}
+
+		outFileName, outExtension := ConvertFile(uniqueFileName)
+		os.Remove(uniqueFileName)
+		if outFileName == "" && outExtension == "" {
+			println("Error converting file:", uniqueFileName)
+			continue
+		}
+		outFileNameFull := JoinFilename(outFileName, outExtension)
+		finalFileName := JoinFilename(msgFileName, outExtension)
+
+		file, err := os.Open(outFileNameFull)
+		if err != nil {
+			println("Error opening new file: ", err)
+		}
+
+		fileReader := tgbotapi.FileReader{
+			Name:   finalFileName,
+			Reader: file,
+		}
+
+		newMsg := tgbotapi.NewDocument(update.Message.Chat.ID, fileReader)
+
+		if _, err := bot.Send(newMsg); err != nil {
+			println("Could not send message.")
+			os.Exit(1)
+		}
+
+		file.Close()
+		os.Remove(outFileNameFull)
+	}
+}

@@ -0,0 +1,8 @@
+services:
+  albus:
+    container_name: albus-go
+    image: albus-go
+    build:
+      context: .
+    env_file: .env
+    restart: unless-stopped

@@ -0,0 +1,10 @@
+module github.com/BiRabittoh/albus-go
+
+go 1.22.3
+
+require (
+	github.com/go-telegram-bot-api/telegram-bot-api/v5 v5.5.1
+	github.com/joho/godotenv v1.5.1
+)
+
+replace github.com/go-telegram-bot-api/telegram-bot-api/v5 => ./telegram-bot-api/

@@ -0,0 +1,4 @@
+github.com/go-telegram-bot-api/telegram-bot-api/v5 v5.5.1 h1:wG8n/XJQ07TmjbITcGiUaOtXxdrINDz1b0J1w0SzqDc=
+github.com/go-telegram-bot-api/telegram-bot-api/v5 v5.5.1/go.mod h1:A2S0CWkNylc2phvKXWBBdD3K0iGnDBGbzRpISP2zBl8=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"io"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+var conversionMap = map[string]string{
+	".docx": ".pdf",
+	".odt":  ".pdf",
+	".epub": ".html",
+}
+
+func SplitFilename(filename string) (name, ext string) {
+	ext = strings.ToLower(filepath.Ext(filename))
+	name = filename[:len(filename)-len(ext)]
+	return name, ext
+}
+
+func JoinFilename(name, ext string) string {
+	if len(ext) > 0 && ext[0] != '.' {
+		ext = "." + ext
+	}
+	return name + ext
+}
+
+func DownloadFile(filePath string, url string) error {
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	out, err := os.Create(filePath)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, resp.Body)
+	return err
+}
+
+func ConvertFile(inputFile string) (string, string) {
+	fileName, fileExtension := SplitFilename(inputFile)
+
+	outputExtension, exists := conversionMap[fileExtension]
+	if !exists {
+		println("Error. Format not supported:", fileExtension)
+		return "", ""
+	}
+
+	outputFile := JoinFilename(fileName, outputExtension)
+	println("Converting...")
+	cmd := exec.Command("pandoc", inputFile, "--pdf-engine=tectonic", "-o", outputFile)
+
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		println("Error. Command execution failed:", err)
+		return "", ""
+	}
+	println(output)
+	return fileName, outputExtension
+}