ship it

Dockerfile

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+FROM reg.zknt.org/zknt/python:3.6.6-r0
+
+COPY requirements.txt /app/requirements.txt
+WORKDIR /app
+RUN apk add --no-cache gcc libxml2 libxslt libxml2-dev musl-dev libxslt-dev python3-dev && pip3 install -r requirements.txt && apk del gcc libxml2-dev musl-dev libxslt-dev python3-dev
+
+COPY . /app
+ENV FLASK_APP=app.py
+VOLUME /data
+EXPOSE 5000
+ENTRYPOINT flask run --host=0.0.0.0

app.py

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+import dbm
+import json
+
+import requests
+from bs4 import BeautifulSoup
+from flask import Flask
+
+
+class Store:
+    def __init__(self, dbo):
+        self.db = dbo
+
+    def add_version(self, pkg, version, bdate, branch='v3.8', arch='x86_64'):
+        pkg_key = json.dumps((pkg, branch, arch))
+        versions = json.loads(self.db.get(pkg_key, "{}"))
+        if bdate not in versions:
+            versions[bdate] = version
+        self.db[pkg_key] = json.dumps(versions)
+
+    def get_feed(self, pkgs=None, branch='v3.8', arch='x86_64'):
+        items = []
+        if not pkgs:
+            pkgs = ['bash']
+        for pkg in pkgs:
+            pkg_key = json.dumps((pkg, branch, arch))
+            items = items + [(pkg, x[0], x[1]) for x in json.loads(self.db.get(pkg_key, "{}")).items()]
+        return gen_feed(items)
+
+
+app = Flask(__name__)
+db = dbm.open('/data/cache', 'c')
+pkg_store = Store(db)
+
+
+def get_release(pkg, branch="v3.8", arch="x86_64"):
+    req = requests.get(
+        "https://pkgs.alpinelinux.org/packages?name={}&branch={}&arch={}".format(
+            pkg,
+            branch,
+            arch,
+        )
+    )
+    soup = BeautifulSoup(req.text, 'html.parser')
+    if not soup.find_all("td", class_="version"):
+        return None
+    if branch == "edge":  # literal edge case -_-
+        ver_link = soup.find_all("td", class_="version")[0].contents[1]
+        version = ver_link.find_all("a")[0].contents[0]
+    else:
+        version = soup.find_all("td", class_="version")[0].contents[0]
+    bdate = soup.find_all("td", class_="bdate")[0].contents[0]
+    return (version, bdate)
+
+
+def gen_feed(items):
+    from feedgen.feed import FeedGenerator
+    from slugify import slugify
+    feedgen = FeedGenerator()
+    feedgen.id('https://alprss.zknt.org/feed/1')
+    feedgen.title('alpine packagefeed')
+    feedgen.link(href='https://alprss.zknt.org/', rel="alternate")
+    feedgen.description('packages')
+    for item in items:
+        feedentry = feedgen.add_entry()
+        feedentry.id('https://alprss.zknt.org/{}/{}-{}'.format(slugify(item[0]), slugify(item[2]), slugify(item[1])))
+        feedentry.title("{} version: {}".format(item[0], item[2]))
+        feedentry.published(item[1] + ' UTC')
+    return feedgen
+
+
+@app.route('/rss')
+def handle():
+    """ Dump all known packags to feed. """
+    for pkg in ["bash"]:
+        try:
+            version, bdate = get_release(pkg)
+            pkg_store.add_version(pkg, version, bdate)
+        except TypeError:
+            pass
+    return pkg_store.get_feed().rss_str()
+
+
+@app.route('/rss/<pkglist>')
+def handle_list(pkglist):
+    for pkg in pkglist.split(','):
+        try:
+            version, bdate = get_release(pkg)
+            pkg_store.add_version(pkg, version, bdate)
+        except TypeError:
+            pass
+    return pkg_store.get_feed(pkglist.split(',')).rss_str()
+
+
+@app.route('/rss/<branch>/<arch>/<pkglist>')
+def handle_params(branch, arch, pkglist):
+    for pkg in pkglist.split(','):
+        try:
+            version, bdate = get_release(pkg, branch=branch, arch=arch)
+            pkg_store.add_version(pkg, version, bdate, branch, arch)
+        except TypeError:
+            pass
+    return pkg_store.get_feed(pkglist.split(','), branch, arch).rss_str()
+
+
+@app.route('/')
+def index():
+    import markdown
+    return markdown.markdown("""
+# alprss
+   
+Provide alpine package search results as RSS feed.
+
+## Usage:
+
+    GET /rss/your,package,list
+
+This will combine results for the packages `your`, `package` and `list`.
+Requesting information on non-existant packages will result in empty output.
+Search is restricted to alpines latest stable branch, and arch x86_64 by default.
+
+    GET /rss/branch/arch/your,package,list
+
+Same as above, but queries supplied alpine branch and arch.
+
+### Example:
+
+    curl https://alprss.zknt.org/rss/vim,emacs
+""")

requirements.txt

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+beautifulsoup4==4.6.3
+feedgen==0.7.0
+requests==2.20.1
+python-slugify==1.2.6
+Flask==1.0.2
+Markdown==3.0.1