Add Reddit API wrapper and related tests; update environment configuration

src/app/social/reddit.py

@@ -0,0 +1,53 @@
+import os
+from praw import Reddit
+from praw.models import Submission, MoreComments
+from .base import SocialWrapper, SocialPost, SocialComment
+
+MAX_COMMENTS = 5
+
+
+def create_social_post(post: Submission) -> SocialPost:
+    social = SocialPost()
+    social.time = str(post.created)
+    social.title = post.title
+    social.description = post.selftext
+
+    for i, top_comment in enumerate(post.comments):
+        if i >= MAX_COMMENTS:
+            break
+        if isinstance(top_comment, MoreComments): #skip MoreComments objects
+            continue
+
+        comment = SocialComment()
+        comment.time = str(top_comment.created)
+        comment.description = top_comment.body
+        social.comments.append(comment)
+    return social
+
+class RedditWrapper(SocialWrapper):
+    """
+    A wrapper for the Reddit API using PRAW (Python Reddit API Wrapper).
+    Requires the following environment variables to be set:
+    - REDDIT_API_CLIENT_ID
+    - REDDIT_API_CLIENT_SECRET
+    You can get them by creating an app at https://www.reddit.com/prefs/apps
+    """
+
+    def __init__(self):
+        self.client_id = os.getenv("REDDIT_API_CLIENT_ID")
+        assert self.client_id is not None, "REDDIT_API_CLIENT_ID environment variable is not set"
+
+        self.client_secret = os.getenv("REDDIT_API_CLIENT_SECRET")
+        assert self.client_secret is not None, "REDDIT_API_CLIENT_SECRET environment variable is not set"
+
+        self.tool = Reddit(
+            client_id=self.client_id,
+            client_secret=self.client_secret,
+            user_agent="upo-appAI",
+        )
+
+    def get_top_crypto_posts(self, limit=5) -> list[SocialPost]:
+        subreddit = self.tool.subreddit("CryptoCurrency")
+        top_posts = subreddit.top(limit=limit, time_filter="week")
+        return [create_social_post(post) for post in top_posts]
+