diff --git a/.github/utils/.gitignore b/.github/utils/.gitignore
new file mode 100644
index 00000000..d50a09fc
--- /dev/null
+++ b/.github/utils/.gitignore
@@ -0,0 +1,2 @@
+.env
+__pycache__/
diff --git a/.github/utils/_get_password.py b/.github/utils/_get_password.py
new file mode 100644
index 00000000..33071b6c
--- /dev/null
+++ b/.github/utils/_get_password.py
@@ -0,0 +1,57 @@
+import base64
+import secrets
+from hashlib import sha256
+from typing import Tuple
+
+import mysql.connector as mysql
+from Crypto.Cipher import AES
+
+
+def get_password(
+    version_name: str,
+    version_code: int,
+    db_host: str,
+    db_user: str,
+    db_pass: str,
+    db_name: str,
+) -> Tuple[str, bytes]:
+    db = mysql.connect(
+        host=db_host,
+        user=db_user,
+        password=db_pass,
+        database=db_name,
+        auth_plugin="mysql_native_password",
+    )
+
+    print(f"Generating passwords for version {version_name} ({version_code})")
+
+    password = base64.b64encode(secrets.token_bytes(16)).decode()
+    iv = secrets.token_bytes(16)
+
+    key = f"{version_name}.{password}.{version_code}"
+    key = sha256(key.encode()).digest()
+    data = "ThisIsOurHardWorkPleaseDoNotCopyOrSteal(c)2019.KubaSz"
+    data = sha256(data.encode()).digest()
+    data = data + (chr(16) * 16).encode()
+
+    aes = AES.new(key=key, mode=AES.MODE_CBC, iv=iv)
+
+    app_password = base64.b64encode(aes.encrypt(data)).decode()
+
+    c = db.cursor()
+    c.execute(
+        "INSERT IGNORE INTO _appPasswords (versionCode, appPassword, password, iv) VALUES (%s, %s, %s, %s);",
+        (version_code, app_password, password, iv),
+    )
+    db.commit()
+
+    c = db.cursor()
+    c.execute(
+        "SELECT password, iv FROM _appPasswords WHERE versionCode = %s;",
+        (version_code,),
+    )
+    row = c.fetchone()
+
+    db.close()
+
+    return (row[0], row[1])
diff --git a/.github/utils/_utils.py b/.github/utils/_utils.py
new file mode 100644
index 00000000..09b59f4a
--- /dev/null
+++ b/.github/utils/_utils.py
@@ -0,0 +1,142 @@
+import re
+import subprocess
+import sys
+from datetime import datetime
+from typing import Tuple
+
+VERSION_NAME_REGEX = r'versionName: "(.+?)"'
+VERSION_CODE_REGEX = r"versionCode: ([0-9]+)"
+VERSION_NAME_FORMAT = 'versionName: "{}"'
+VERSION_CODE_FORMAT = "versionCode: {}"
+
+
+def get_project_dir() -> str:
+    project_dir = sys.argv[1]
+    if project_dir[-1:] == "/" or project_dir[-1:] == "\\":
+        project_dir = project_dir[:-1]
+    return project_dir
+
+
+def read_gradle_version(project_dir: str) -> Tuple[int, str]:
+    GRADLE_PATH = f"{project_dir}/build.gradle"
+
+    with open(GRADLE_PATH, "r") as f:
+        gradle = f.read()
+
+    version_name = re.search(VERSION_NAME_REGEX, gradle).group(1)
+    version_code = int(re.search(VERSION_CODE_REGEX, gradle).group(1))
+
+    return (version_code, version_name)
+
+
+def write_gradle_version(project_dir: str, version_code: int, version_name: str):
+    GRADLE_PATH = f"{project_dir}/build.gradle"
+
+    with open(GRADLE_PATH, "r") as f:
+        gradle = f.read()
+
+    gradle = re.sub(
+        VERSION_NAME_REGEX, VERSION_NAME_FORMAT.format(version_name), gradle
+    )
+    gradle = re.sub(
+        VERSION_CODE_REGEX, VERSION_CODE_FORMAT.format(version_code), gradle
+    )
+
+    with open(GRADLE_PATH, "w") as f:
+        f.write(gradle)
+
+
+def build_version_code(version_name: str) -> int:
+    version = version_name.split("+")[0].split("-")
+    version_base = version[0]
+    version_suffix = version[1] if len(version) == 2 else ""
+
+    base_parts = version_base.split(".")
+    major = int(base_parts[0]) or 0
+    minor = int(base_parts[1]) if len(base_parts) > 1 else 0
+    patch = int(base_parts[2]) if len(base_parts) > 2 else 0
+
+    beta = 9
+    rc = 9
+    if "dev" in version_suffix:
+        beta = 0
+        rc = 0
+    elif "beta." in version_suffix:
+        beta = int(version_suffix.split(".")[1])
+        rc = 0
+    elif "rc." in version_suffix:
+        beta = 0
+        rc = int(version_suffix.split(".")[1])
+
+    version_code = beta + rc * 10 + patch * 100 + minor * 10000 + major * 1000000
+    return version_code
+
+
+def get_changelog(project_dir: str, format: str) -> Tuple[str, str]:
+    with open(
+        f"{project_dir}/app/src/main/assets/pl-changelog.html", "r", encoding="utf-8"
+    ) as f:
+        changelog = f.read()
+
+    title = re.search(r"<h3>(.+?)</h3>", changelog).group(1)
+    content = re.search(r"(?s)<ul>(.+)</ul>", changelog).group(1).strip()
+    content = "\n".join(line.strip() for line in content.split("\n"))
+
+    if format != "html":
+        content = content.replace("<li>", "- ")
+        content = content.replace("<br>", "\n")
+        if format == "markdown":
+            content = re.sub(r"<u>(.+?)</u>", "__\\1__", content)
+            content = re.sub(r"<i>(.+?)</i>", "*\\1*", content)
+            content = re.sub(r"<b>(.+?)</b>", "**\\1**", content)
+        content = re.sub(r"</?.+?>", "", content)
+
+    return (title, content)
+
+
+def get_commit_log(project_dir: str, format: str, max_lines: int = None) -> str:
+    last_tag = (
+        subprocess.check_output("git describe --tags --abbrev=0".split(" "))
+        .decode()
+        .strip()
+    )
+
+    log = subprocess.run(
+        args=f"git log {last_tag}..HEAD --format=%an%x00%at%x00%h%x00%s%x00%D".split(" "),
+        cwd=project_dir,
+        stdout=subprocess.PIPE,
+    )
+    log = log.stdout.strip().decode()
+
+    commits = [line.split("\x00") for line in log.split("\n")]
+    if max_lines:
+        commits = commits[:max_lines]
+
+    output = []
+    valid = False
+
+    for commit in commits:
+        if not commit[0]:
+            continue
+        if "origin/" in commit[4]:
+            valid = True
+        if not valid:
+            continue
+        date = datetime.fromtimestamp(float(commit[1]))
+        date = date.strftime("%Y-%m-%d %H:%M:%S")
+        if format == "html":
+            output.append(f"<li>{commit[3]} <i> - {commit[0]}</i></li>")
+        elif format == "markdown":
+            output.append(f"[{date}] {commit[0]}\n    {commit[3]}")
+        elif format == "markdown_full":
+            output.append(
+                f"_[{date}] {commit[0]}_\n`    `__`{commit[2]}`__  **{commit[3]}**"
+            )
+        elif format == "plain":
+            output.append(f"- {commit[3]}")
+
+    if format == "markdown":
+        output.insert(0, "```")
+        output.append("```")
+
+    return "\n".join(output)
diff --git a/.github/utils/bump_nightly.py b/.github/utils/bump_nightly.py
new file mode 100644
index 00000000..888a087f
--- /dev/null
+++ b/.github/utils/bump_nightly.py
@@ -0,0 +1,69 @@
+import json
+import os
+import re
+import sys
+from datetime import datetime, timedelta
+
+import requests
+
+from _utils import (
+    get_commit_log,
+    get_project_dir,
+    read_gradle_version,
+    write_gradle_version,
+)
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("usage: bump_nightly.py <project dir>")
+        exit(-1)
+
+    repo = os.getenv("GITHUB_REPOSITORY")
+    sha = os.getenv("GITHUB_SHA")
+
+    if not repo or not sha:
+        print("Missing GitHub environment variables.")
+        exit(-1)
+
+    with requests.get(
+        f"https://api.github.com/repos/{repo}/actions/runs?per_page=1&status=success"
+    ) as r:
+        data = json.loads(r.text)
+        runs = [run for run in data["workflow_runs"] if run["head_sha"] == sha]
+        if runs:
+            print("::set-output name=hasNewChanges::false")
+            exit(0)
+
+    print("::set-output name=hasNewChanges::true")
+
+    project_dir = get_project_dir()
+
+    (version_code, version_name) = read_gradle_version(project_dir)
+    version_name = version_name.split("+")[0]
+
+    date = datetime.now()
+    if date.hour > 6:
+        version_name += "+daily." + date.strftime("%Y%m%d-%H%M")
+    else:
+        date -= timedelta(days=1)
+        version_name += "+nightly." + date.strftime("%Y%m%d")
+
+    print("::set-output name=appVersionName::" + version_name)
+    print("::set-output name=appVersionCode::" + str(version_code))
+
+    write_gradle_version(project_dir, version_code, version_name)
+
+    commit_log = get_commit_log(project_dir, format="html", max_lines=10)
+
+    with open(
+        f"{project_dir}/app/src/main/assets/pl-changelog.html", "r", encoding="utf-8"
+    ) as f:
+        changelog = f.read()
+
+    changelog = re.sub(r"<h3>(.+?)</h3>", f"<h3>{version_name}</h3>", changelog)
+    changelog = re.sub(r"(?s)<ul>(.+)</ul>", f"<ul>\n{commit_log}\n</ul>", changelog)
+
+    with open(
+        f"{project_dir}/app/src/main/assets/pl-changelog.html", "w", encoding="utf-8"
+    ) as f:
+        f.write(changelog)
diff --git a/.github/utils/bump_version.py b/.github/utils/bump_version.py
new file mode 100644
index 00000000..80d36519
--- /dev/null
+++ b/.github/utils/bump_version.py
@@ -0,0 +1,41 @@
+import os
+
+from dotenv import load_dotenv
+
+from _get_password import get_password
+from _utils import build_version_code, write_gradle_version
+from sign import sign
+
+if __name__ == "__main__":
+    version_name = input("Enter version name: ")
+    version_code = build_version_code(version_name)
+
+    print(f"Bumping version to {version_name} ({version_code})")
+
+    project_dir = "../.."
+
+    load_dotenv()
+    DB_HOST = os.getenv("DB_HOST")
+    DB_USER = os.getenv("DB_USER")
+    DB_PASS = os.getenv("DB_PASS")
+    DB_NAME = os.getenv("DB_NAME")
+
+    write_gradle_version(project_dir, version_code, version_name)
+    (password, iv) = get_password(
+        version_name, version_code, DB_HOST, DB_USER, DB_PASS, DB_NAME
+    )
+
+    sign(project_dir, version_name, version_code, password, iv, commit=False)
+
+    print("Writing mock passwords")
+    os.chdir(project_dir)
+    os.system(
+        "sed -i -E 's/\/\*([0-9a-f]{2} ?){16}\*\//\/*secret password - removed for source code publication*\//g' app/src/main/cpp/szkolny-signing.cpp"
+    )
+    os.system(
+        "sed -i -E 's/\\t0x.., 0x(.)., 0x.(.), 0x.(.), 0x.., 0x.., 0x.., 0x.(.), 0x.., 0x.(.), 0x(.)., 0x(.)., 0x.., 0x.., 0x.., 0x.(.)/\\t0x\\3\\6, 0x\\7\\4, 0x\\1\\8, 0x\\2\\5, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff /g' app/src/main/cpp/szkolny-signing.cpp"
+    )
+    os.system(
+        "sed -i -E 's/param1\..(.).(.).(.).(.)..(.)..(.)..(.)..(.).../param1.MTIzNDU2Nzg5MD\\5\\2\\7\\6\\1\\3\\4\8==/g' app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt"
+    )
+    input("Press any key to finish")
diff --git a/.github/utils/extract_changelogs.py b/.github/utils/extract_changelogs.py
new file mode 100644
index 00000000..07524bad
--- /dev/null
+++ b/.github/utils/extract_changelogs.py
@@ -0,0 +1,59 @@
+import os
+import sys
+
+from _utils import get_changelog, get_commit_log, get_project_dir, read_gradle_version
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("usage: extract_changelogs.py <project dir>")
+        exit(-1)
+
+    project_dir = get_project_dir()
+
+    (version_code, version_name) = read_gradle_version(project_dir)
+
+    print("::set-output name=appVersionName::" + version_name)
+    print("::set-output name=appVersionCode::" + str(version_code))
+
+    dir = f"{project_dir}/app/release/whatsnew-{version_name}/"
+    os.makedirs(dir, exist_ok=True)
+
+    print("::set-output name=changelogDir::" + dir)
+
+    (title, changelog) = get_changelog(project_dir, format="plain")
+    with open(dir + "whatsnew-pl-PL", "w", encoding="utf-8") as f:
+        f.write(changelog)
+    print("::set-output name=changelogPlainFile::" + dir + "whatsnew-pl-PL")
+
+    with open(dir + "whatsnew-titled.txt", "w", encoding="utf-8") as f:
+        f.write(title)
+        f.write("\n")
+        f.write(changelog)
+    print("::set-output name=changelogPlainTitledFile::" + dir + "whatsnew-titled.txt")
+
+    print("::set-output name=changelogTitle::" + title)
+
+    (_, changelog) = get_changelog(project_dir, format="markdown")
+    with open(dir + "whatsnew.md", "w", encoding="utf-8") as f:
+        f.write(changelog)
+    print("::set-output name=changelogMarkdownFile::" + dir + "whatsnew.md")
+
+    (_, changelog) = get_changelog(project_dir, format="html")
+    with open(dir + "whatsnew.html", "w", encoding="utf-8") as f:
+        f.write(changelog)
+    print("::set-output name=changelogHtmlFile::" + dir + "whatsnew.html")
+
+    changelog = get_commit_log(project_dir, format="plain", max_lines=10)
+    with open(dir + "commit_log.txt", "w", encoding="utf-8") as f:
+        f.write(changelog)
+    print("::set-output name=commitLogPlainFile::" + dir + "commit_log.txt")
+
+    changelog = get_commit_log(project_dir, format="markdown", max_lines=10)
+    with open(dir + "commit_log.md", "w", encoding="utf-8") as f:
+        f.write(changelog)
+    print("::set-output name=commitLogMarkdownFile::" + dir + "commit_log.md")
+
+    changelog = get_commit_log(project_dir, format="html", max_lines=10)
+    with open(dir + "commit_log.html", "w", encoding="utf-8") as f:
+        f.write(changelog)
+    print("::set-output name=commitLogHtmlFile::" + dir + "commit_log.html")
diff --git a/.github/utils/rename_artifacts.py b/.github/utils/rename_artifacts.py
new file mode 100644
index 00000000..4eeabfaf
--- /dev/null
+++ b/.github/utils/rename_artifacts.py
@@ -0,0 +1,26 @@
+import glob
+import os
+import sys
+
+from _utils import get_project_dir
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("usage: rename_artifacts.py <project dir>")
+        exit(-1)
+
+    project_dir = get_project_dir()
+
+    files = glob.glob(f"{project_dir}/app/release/*.*")
+    for file in files:
+        file_relative = file.replace(os.getenv("GITHUB_WORKSPACE") + "/", "")
+        if "-aligned.apk" in file:
+            os.unlink(file)
+        elif "-signed.apk" in file:
+            new_file = file.replace("-signed.apk", ".apk")
+            if os.path.isfile(new_file):
+                os.unlink(new_file)
+            os.rename(file, new_file)
+        elif ".apk" in file or ".aab" in file:
+            print("::set-output name=signedReleaseFile::" + file)
+            print("::set-output name=signedReleaseFileRelative::" + file_relative)
diff --git a/.github/utils/save_version.py b/.github/utils/save_version.py
new file mode 100644
index 00000000..01de17a7
--- /dev/null
+++ b/.github/utils/save_version.py
@@ -0,0 +1,122 @@
+import glob
+import os
+import sys
+from datetime import datetime
+from time import time
+
+import mysql.connector as mysql
+from dotenv import load_dotenv
+
+from _utils import get_changelog, get_commit_log, get_project_dir, read_gradle_version
+
+
+def save_version(
+    project_dir: str,
+    db_host: str,
+    db_user: str,
+    db_pass: str,
+    db_name: str,
+    apk_server_release: str,
+    apk_server_nightly: str,
+):
+    db = mysql.connect(
+        host=db_host,
+        user=db_user,
+        password=db_pass,
+        database=db_name,
+        auth_plugin="mysql_native_password",
+    )
+
+    (version_code, version_name) = read_gradle_version(project_dir)
+    (_, changelog) = get_changelog(project_dir, format="html")
+
+    types = ["dev", "beta", "nightly", "daily", "rc", "release"]
+    build_type = [x for x in types if x in version_name]
+    build_type = build_type[0] if build_type else "release"
+
+    if "+nightly." in version_name or "+daily." in version_name:
+        changelog = get_commit_log(project_dir, format="html")
+        build_type = "nightly"
+    elif "-dev" in version_name:
+        build_type = "dev"
+    elif "-beta." in version_name:
+        build_type = "beta"
+    elif "-rc." in version_name:
+        build_type = "rc"
+
+    build_date = int(time())
+    apk_name = None
+    bundle_name_play = None
+
+    files = glob.glob(f"{project_dir}/app/release/*.*")
+    output_apk = f"Edziennik_{version_name}_official.apk"
+    output_aab_play = f"Edziennik_{version_name}_play.aab"
+    for file in files:
+        if output_apk in file:
+            build_date = int(os.stat(file).st_mtime)
+            apk_name = output_apk
+        if output_aab_play in file:
+            build_date = int(os.stat(file).st_mtime)
+            bundle_name_play = output_aab_play
+
+    build_date = datetime.fromtimestamp(build_date).strftime("%Y-%m-%d %H:%M:%S")
+
+    if build_type in ["nightly", "daily"]:
+        download_url = apk_server_nightly + apk_name if apk_name else None
+    else:
+        download_url = apk_server_release + apk_name if apk_name else None
+
+    cols = [
+        "versionCode",
+        "versionName",
+        "releaseDate",
+        "releaseNotes",
+        "releaseType",
+        "downloadUrl",
+        "apkName",
+        "bundleNamePlay",
+    ]
+    updated = {
+        "versionCode": version_code,
+        "downloadUrl": download_url,
+        "apkName": apk_name,
+        "bundleNamePlay": bundle_name_play,
+    }
+
+    values = [
+        version_code,
+        version_name,
+        build_date,
+        changelog,
+        build_type,
+        download_url,
+        apk_name,
+        bundle_name_play,
+    ]
+    values.extend(val for val in updated.values() if val)
+
+    updated = ", ".join(f"{col} = %s" for (col, val) in updated.items() if val)
+
+    sql = f"INSERT INTO updates ({', '.join(cols)}) VALUES ({'%s, ' * (len(cols) - 1)}%s) ON DUPLICATE KEY UPDATE {updated};"
+
+    c = db.cursor()
+    c.execute(sql, tuple(values))
+    db.commit()
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("usage: save_version.py <project dir>")
+        exit(-1)
+
+    project_dir = get_project_dir()
+
+    load_dotenv()
+    DB_HOST = os.getenv("DB_HOST")
+    DB_USER = os.getenv("DB_USER")
+    DB_PASS = os.getenv("DB_PASS")
+    DB_NAME = os.getenv("DB_NAME")
+    APK_SERVER_RELEASE = os.getenv("APK_SERVER_RELEASE")
+    APK_SERVER_NIGHTLY = os.getenv("APK_SERVER_NIGHTLY")
+
+    save_version(project_dir, DB_HOST, DB_USER, DB_PASS, DB_NAME, APK_SERVER_RELEASE, APK_SERVER_NIGHTLY)
diff --git a/.github/utils/sign.py b/.github/utils/sign.py
new file mode 100644
index 00000000..026d819b
--- /dev/null
+++ b/.github/utils/sign.py
@@ -0,0 +1,84 @@
+import os
+import re
+import sys
+
+from dotenv import load_dotenv
+
+from _get_password import get_password
+from _utils import get_project_dir, read_gradle_version
+
+
+def sign(
+    project_dir: str,
+    version_name: str,
+    version_code: int,
+    password: str,
+    iv: bytes,
+    commit: bool = False,
+):
+    SIGNING_PATH = f"{project_dir}/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt"
+    CPP_PATH = f"{project_dir}/app/src/main/cpp/szkolny-signing.cpp"
+
+    with open(SIGNING_PATH, "r") as f:
+        signing = f.read()
+
+    with open(CPP_PATH, "r") as f:
+        cpp = f.read()
+
+    SIGNING_REGEX = r"\$param1\..*\.\$param2"
+    CPP_REGEX = r"(?s)/\*.+?toys AES_IV\[16\] = {.+?};"
+
+    SIGNING_FORMAT = "$param1.{}.$param2"
+    CPP_FORMAT = "/*{}*/\nstatic toys AES_IV[16] = {{\n\t{} }};"
+
+    print(f"Writing passwords for version {version_name} ({version_code})")
+
+    iv_hex = " ".join(["{:02x}".format(x) for x in iv])
+    iv_cpp = ", ".join(["0x{:02x}".format(x) for x in iv])
+
+    signing = re.sub(SIGNING_REGEX, SIGNING_FORMAT.format(password), signing)
+    cpp = re.sub(CPP_REGEX, CPP_FORMAT.format(iv_hex, iv_cpp), cpp)
+
+    with open(SIGNING_PATH, "w") as f:
+        f.write(signing)
+
+    with open(CPP_PATH, "w") as f:
+        f.write(cpp)
+
+    if commit:
+        os.chdir(project_dir)
+        os.system("git add .")
+        os.system(
+            f'git commit -m "[{version_name}] Update build.gradle, signing and changelog."'
+        )
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("usage: sign.py <project dir> [commit]")
+        exit(-1)
+
+    project_dir = get_project_dir()
+
+    load_dotenv()
+    DB_HOST = os.getenv("DB_HOST")
+    DB_USER = os.getenv("DB_USER")
+    DB_PASS = os.getenv("DB_PASS")
+    DB_NAME = os.getenv("DB_NAME")
+
+    (version_code, version_name) = read_gradle_version(project_dir)
+    (password, iv) = get_password(
+        version_name, version_code, DB_HOST, DB_USER, DB_PASS, DB_NAME
+    )
+
+    print("::set-output name=appVersionName::" + version_name)
+    print("::set-output name=appVersionCode::" + str(version_code))
+
+    sign(
+        project_dir,
+        version_name,
+        version_code,
+        password,
+        iv,
+        commit="commit" in sys.argv,
+    )
diff --git a/.github/utils/webhook_discord.py b/.github/utils/webhook_discord.py
new file mode 100644
index 00000000..3c1404ae
--- /dev/null
+++ b/.github/utils/webhook_discord.py
@@ -0,0 +1,118 @@
+import os
+import sys
+from datetime import datetime
+
+import requests
+from dotenv import load_dotenv
+
+from _utils import get_changelog, get_commit_log, get_project_dir, read_gradle_version
+
+
+def post_webhook(
+    project_dir: str,
+    apk_file: str,
+    apk_server_release: str,
+    apk_server_nightly: str,
+    webhook_release: str,
+    webhook_testing: str,
+):
+    (_, version_name) = read_gradle_version(project_dir)
+
+    types = ["dev", "beta", "nightly", "daily", "rc", "release"]
+    build_type = [x for x in types if x in version_name]
+    build_type = build_type[0] if build_type else None
+
+    testing = ["dev", "beta", "nightly", "daily"]
+    testing = build_type in testing
+
+    apk_name = os.path.basename(apk_file)
+    if build_type in ["nightly", "daily"]:
+        download_url = apk_server_nightly + apk_name
+    else:
+        download_url = apk_server_release + apk_name
+
+    if testing:
+        build_date = int(os.stat(apk_file).st_mtime)
+        if build_date:
+            build_date = datetime.fromtimestamp(build_date).strftime("%Y-%m-%d %H:%M")
+
+        # untagged release, get commit log
+        if build_type in ["nightly", "daily"]:
+            changelog = get_commit_log(project_dir, format="markdown", max_lines=5)
+        else:
+            changelog = get_changelog(project_dir, format="markdown")
+
+        webhook = get_webhook_testing(
+            version_name, build_type, changelog, download_url, build_date
+        )
+        requests.post(url=webhook_testing, json=webhook)
+    else:
+        changelog = get_changelog(project_dir, format="markdown")
+        webhook = get_webhook_release(changelog, download_url)
+        requests.post(url=webhook_release, json=webhook)
+
+
+def get_webhook_release(changelog: str, download_url: str):
+    (title, content) = changelog
+    return {"content": f"__**{title}**__\n{content}\n{download_url}"}
+
+
+def get_webhook_testing(
+    version_name: str,
+    build_type: str,
+    changelog: str,
+    download_url: str,
+    build_date: str,
+):
+    return {
+        "embeds": [
+            {
+                "title": f"Nowa wersja {build_type} aplikacji Szkolny.eu",
+                "description": f"Dostępna jest nowa wersja testowa **{build_type}**.",
+                "color": 2201331,
+                "fields": [
+                    {
+                        "name": f"Wersja `{version_name}`",
+                        "value": f"[Pobierz .APK]({download_url})"
+                        if download_url
+                        else "*Pobieranie niedostępne*",
+                        "inline": False,
+                    },
+                    {
+                        "name": "Data kompilacji",
+                        "value": build_date or "-",
+                        "inline": False,
+                    },
+                    {
+                        "name": "Ostatnie zmiany",
+                        "value": changelog or "-",
+                        "inline": False,
+                    },
+                ],
+            }
+        ]
+    }
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("usage: webhook_discord.py <project dir>")
+        exit(-1)
+
+    project_dir = get_project_dir()
+
+    load_dotenv()
+    APK_FILE = os.getenv("APK_FILE")
+    APK_SERVER_RELEASE = os.getenv("APK_SERVER_RELEASE")
+    APK_SERVER_NIGHTLY = os.getenv("APK_SERVER_NIGHTLY")
+    WEBHOOK_RELEASE = os.getenv("WEBHOOK_RELEASE")
+    WEBHOOK_TESTING = os.getenv("WEBHOOK_TESTING")
+
+    post_webhook(
+        project_dir,
+        APK_FILE,
+        APK_SERVER_RELEASE,
+        APK_SERVER_NIGHTLY,
+        WEBHOOK_RELEASE,
+        WEBHOOK_TESTING,
+    )