Issue 4028 - Add support for Edge extensions to buildtools

packagerEdge.py

Index: packagerEdge.py
===================================================================
new file mode 100644
--- /dev/null
+++ b/packagerEdge.py
@@ -0,0 +1,175 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import base64
+import hashlib
+import json
+import mimetypes
+import os
+import zipfile
+
+import packager
+import packagerChrome
+
+# Files and directories expected inside of the .APPX archive.
+MANIFEST = 'AppxManifest.xml'
+CONTENT_TYPES = '[Content_Types].xml'
+BLOCKMAP = 'AppxBlockMap.xml'
+EXTENSION_DIR = 'Extension'
+ASSETS_DIR = 'Assets'
+
+# Size of uncompressed block in the APPX block map.
+BLOCKSIZE = 64 * 1024
+
+defaultLocale = packagerChrome.defaultLocale
+
+
+def _get_template_for(filename):
+    return packager.getTemplate('edge/{}.tmpl'.format(filename))
+
+
+def _lfh_size(filename):
+    """Compute the size of zip local file header for `filename`."""
+    try:
+        filename = filename.encode('utf-8')
+    except UnicodeDecodeError:
+        pass  # filename is already a byte string.
+    return zipfile.sizeFileHeader + len(filename)
+
+
+def _make_blockmap_entry(filename, data):
+    blocks = [data[i:i + BLOCKSIZE] for i in range(0, len(data), BLOCKSIZE)]
+    return {
+        'name': filename.replace('/', '\\'),
+        'size': len(data),
+        'lfh_size': _lfh_size(filename),
+        'blocks': [
+            {'hash': base64.b64encode(hashlib.sha256(block).digest())}
+            for block in blocks
+        ]
+    }
+
+
+def create_appx_blockmap(files):
+    """Create APPX blockmap for the list of files."""
+    template = _get_template_for(BLOCKMAP)
+    files = [_make_blockmap_entry(n, d) for n, d in files.items()]
+    return template.render(files=files).encode('utf-8')
+
+
+def load_translation(files, locale):
+    """Load translation strings for locale from files."""
+    path = '{}/_locales/{}/messages.json'.format(EXTENSION_DIR, locale)
+    return json.loads(files[path])
+
+
+def create_appx_manifest(params, files):
+    """Create AppxManifest.xml."""
+    template = _get_template_for(MANIFEST)
+    params = dict(params)
+    translation = load_translation(files, defaultLocale)
+    params['display_name'] = translation['name']
+    params['description'] = translation['description']
+    metadata = params['metadata']
+    params['package_identity'] = dict(metadata.items('package_identity'))
+    w = params['windows_version'] = {}
+    w['min'], w['max'] = metadata.get('compat', 'windows').split('/')
+    params.update(metadata.items('general'))
+    for size in ['44', '50', '150']:
+        path = '{}/logo_{}.png'.format(ASSETS_DIR, size)
+        if path not in files:
+            raise KeyError(path + 'is not found in files')
+        params['logo_' + size] = path.replace('/', '\\')
+    return template.render(params).encode('utf-8')
+
+
+def move_files_to_extension(files):
+    """Move all files into `Extension` folder for APPX packaging."""
+    # We sort the files to ensure that 'Extension/xyz' is moved before 'xyz'.
+    # If 'xyz' is moved first, it would overwrite 'Extension/xyz' and its
+    # original content would be lost.
+    names = sorted(files.keys(), key=len, reverse=True)
+    for filename in names:
+        files['{}/{}'.format(EXTENSION_DIR, filename)] = files.pop(filename)
+
+
+def create_content_types_map(filenames):
+    """Create [Content_Types].xml -- a mime type map."""
+    params = {'defaults': {}, 'overrides': {}}
+    overrides = {
+        BLOCKMAP: 'application/vnd.ms-appx.blockmap+xml',
+        MANIFEST: 'application/vnd.ms-appx.manifest+xml'
+    }
+    for filename in filenames:
+        ext = os.path.splitext(filename)[1]
+        if ext:
+            content_type = mimetypes.guess_type(filename, strict=False)[0]
+            if content_type is not None:
+                params['defaults'][ext[1:]] = content_type
+        if filename in overrides:
+            params['overrides']['/' + filename] = overrides[filename]
+    content_types_template = _get_template_for(CONTENT_TYPES)
+    return content_types_template.render(params).encode('utf-8')
+
+
+def createBuild(baseDir, type='edge', outFile=None,  # noqa: preserve API.
+                buildNum=None, releaseBuild=False, keyFile=None,
+                devenv=False):
+
+    metadata = packager.readMetadata(baseDir, type)
+    version = packager.getBuildVersion(baseDir, metadata, releaseBuild,
+                                       buildNum)
+
+    outfile = outFile or packager.getDefaultFileName(metadata, version, 'appx')
+
+    params = {
+        'type': type,
+        'baseDir': baseDir,
+        'releaseBuild': releaseBuild,
+        'version': version,
+        'devenv': devenv,
+        'metadata': metadata,
+    }
+
+    files = packager.Files(packagerChrome.getPackageFiles(params),
+                           packagerChrome.getIgnoredFiles(params))
+
+    if metadata.has_section('mapping'):
+        mapped = metadata.items('mapping')
+        files.readMappedFiles(mapped)
+        files.read(baseDir, skip=[filename for filename, _ in mapped])
+    else:
+        files.read(baseDir)
+
+    if metadata.has_section('convert_js'):
+        packagerChrome.convertJS(params, files)
+
+    if metadata.has_section('preprocess'):
+        files.preprocess(metadata.options('preprocess'), {'needsExt': True})
+
+    if metadata.has_section('import_locales'):
+        packagerChrome.importGeckoLocales(params, files)
+
+    files['manifest.json'] = packagerChrome.createManifest(params, files)
+
+    move_files_to_extension(files)
+
+    if metadata.has_section('appx_assets'):
+        for name, path in metadata.items('appx_assets'):
+            path = os.path.join(baseDir, path)
+            files.read(path, '{}/{}'.format(ASSETS_DIR, name))
+
+    files[MANIFEST] = create_appx_manifest(params, files)
+    files[CONTENT_TYPES] = create_content_types_map(files.keys() + [BLOCKMAP])
+
+    # We don't support AppxBlockmap.xml generation for compressed zip files at
+    # the moment. The only way to reliably calculate the compressed size of
+    # each 64k chunk in the zip file is to override the relevant parts of
+    # `zipfile` library. We have chosen to not do it for now, so we produce
+    # an uncompressed zip file.
+    files[BLOCKMAP] = create_appx_blockmap(files)
+
+    # TODO: Implement AppxBlockmap.xml generation for compressed zip files.
+    # https://issues.adblockplus.org/ticket/4149
+    files.zip(outfile, compress=False)