Add basic server that supports registration and display of the data, coded in 30 minutes

server.py

@@ -0,0 +1,85 @@
+from flask import *
+from flask_sqlalchemy import SQLAlchemy
+import crypto, hashlib
+
+app = Flask("the1024club")
+app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///the1024.db"
+db = SQLAlchemy(app)
+
+
+class User(db.Model):
+    __tablename__ = "the1024"
+    id = db.Column(db.Integer, primary_key=True)
+    fingerprint = db.Column(db.Text, nullable=False, unique=True)
+    pubkey = db.Column(db.LargeBinary, nullable=False)
+    data = db.Column(db.LargeBinary)
+    mime_type = db.Column(db.Text, default="text/plain; charset=UTF-8")
+
+
+db.create_all()
+
+
+@app.route("/")
+def home():
+    return "TODO: implement home page"
+
+
+@app.route("/register", methods=["GET", "POST"])
+def register():
+    if request.method == "GET":
+        return "TODO: registration info page (registration form?)"
+    pubkey = request.files.get("public_key")
+    if not pubkey:
+        response = make_response(
+            jsonify(dict(error="Provide a public key as file `public_key`.")),
+            400)
+        response.headers["Content-Type"] = "application/json"
+        return response
+    pubkey = pubkey.read()
+    if not crypto.supports(pubkey):
+        response = make_response(
+            jsonify(
+                dict(error="Unsupported public key type. Supported types: " +
+                     (", ".join([
+                         f.__name__.replace("PublicKey", "")
+                         for f in crypto.SUPPORTED_PUBLIC_KEY_FORMATS
+                     ])))), 400)
+        response.headers["Content-Type"] = "application/json"
+        return response
+    fingerprint = hashlib.sha256(pubkey).hexdigest()
+    # is there already a hash with that fingerprint in the database?
+    if User.query.filter_by(fingerprint=fingerprint).all():
+        response = make_response(
+            jsonify(
+                dict(
+                    error=
+                    "A public key with this hash already exists in the database."
+                )), 400)
+        response.headers["Content-Type"] = "application/json"
+        return response
+    # do the magic
+    new_user = User(fingerprint=fingerprint, pubkey=pubkey)
+    db.session.add(new_user)
+    db.session.commit()
+    response = make_response(
+        jsonify(
+            dict(
+                error=None,
+                url=url_for("render_data", fingerprint=fingerprint))), 200)
+    response.headers["Content-Type"] = "application/json"
+    return response
+
+
+@app.route("/<fingerprint>", methods=["GET", "UPDATE", "DELETE"])
+def render_data(fingerprint):
+    if request.method == "GET":
+        user = User.query.filter_by(fingerprint=fingerprint).first()
+        if not user: return abort(404)
+        resp = make_response(user.data or b"", 200)
+        resp.headers["Content-Type"] = user.mime_type
+        return resp
+    return abort(501)
+
+
+if __name__ == "__main__":
+    app.run(port=65532)