feat: Implement email sending utilities and templates for job notifications

- Added email_service.py for sending emails with SMTP configuration.
- Introduced email_templates.py to render job alert email subjects and bodies.
- Enhanced scraper.py to extract contact information from job listings.
- Updated settings.js to handle negative keyword input validation.
- Created email.html and email_templates.html for managing email subscriptions and templates in the admin interface.
- Modified base.html to include links for email alerts and templates.
- Expanded user settings.html to allow management of negative keywords.
- Updated utils.py to include functions for retrieving negative keywords and email settings.
- Enhanced job filtering logic to exclude jobs containing negative keywords.

tests/test_user_negative_keywords.py

@@ -0,0 +1,148 @@
+import pytest
+from web.db import (
+    db_init,
+    create_or_update_user,
+    upsert_negative_keyword,
+    set_user_negative_keywords,
+    get_user_negative_keywords,
+    upsert_listing,
+    upsert_job_details,
+    get_all_jobs,
+    UserNegativeKeyword,
+    NegativeKeyword
+)
+from web.app import app
+from web.utils import filter_jobs
+
+
+@pytest.fixture
+def client():
+    app.config['TESTING'] = True
+    app.config['WTF_CSRF_ENABLED'] = False
+    with app.test_client() as client:
+        with app.app_context():
+            db_init()
+        yield client
+
+
+def test_negative_keyword_db_ops():
+    db_init()
+    username = "test_neg_user"
+    create_or_update_user(username, "password")
+
+    # Test upsert
+    kid = upsert_negative_keyword("scam")
+    assert kid > 0
+    kid2 = upsert_negative_keyword("scam")
+    assert kid == kid2
+
+    # Test set/get
+    set_user_negative_keywords(username, ["scam", "unpaid"])
+    nks = get_user_negative_keywords(username)
+    assert len(nks) == 2
+    assert "scam" in nks
+    assert "unpaid" in nks
+
+    # Test update
+    set_user_negative_keywords(username, ["scam"])
+    nks = get_user_negative_keywords(username)
+    assert len(nks) == 1
+    assert "scam" in nks
+    assert "unpaid" not in nks
+
+    # Test clear
+    set_user_negative_keywords(username, [])
+    nks = get_user_negative_keywords(username)
+    assert len(nks) == 0
+
+
+def test_settings_endpoint(client):
+    username = "test_settings_user"
+    create_or_update_user(username, "password")
+
+    # Login
+    client.post('/login', data={'username': username, 'password': 'password'})
+
+    # Post settings
+    resp = client.post('/settings', json={
+        'regions': [],
+        'keywords': [],
+        'negative_keywords': ['spam', 'junk']
+    })
+    assert resp.status_code == 200
+
+    # Verify DB
+    nks = get_user_negative_keywords(username)
+    assert "spam" in nks
+    assert "junk" in nks
+
+
+def test_job_filtering_with_negative_keywords():
+    # Setup jobs
+    jobs = [
+        {"title": "Great Job", "description": "Good pay"},
+        {"title": "Bad Job", "description": "This is a scam"},
+        {"title": "Okay Job", "description": "Average pay"},
+    ]
+
+    # Filter
+    filtered = filter_jobs(jobs, negative_keywords=["scam"])
+    assert len(filtered) == 2
+    assert "Bad Job" not in [j['title'] for j in filtered]
+
+    filtered = filter_jobs(jobs, negative_keywords=["pay"])
+    assert len(filtered) == 1
+    assert "Bad Job" in [j['title']
+                         for j in filtered]  # "scam" job doesn't have "pay"
+
+
+def test_jobs_endpoint_filtering(client):
+    username = "test_filter_user"
+    create_or_update_user(username, "password")
+
+    # Setup DB with jobs
+    upsert_listing(
+        url="http://example.com/1",
+        region="sfbay",
+        keyword="python",
+        title="Good Python Job",
+        pay="$100k",
+        location="SF",
+        timestamp="now"
+    )
+    upsert_job_details({
+        "url": "http://example.com/1",
+        "id": "1",
+        "title": "Good Python Job",
+        "description": "This is a legit job."
+    })
+
+    upsert_listing(
+        url="http://example.com/2",
+        region="sfbay",
+        keyword="python",
+        title="Bad Python Job",
+        pay="$100k",
+        location="SF",
+        timestamp="now"
+    )
+    upsert_job_details({
+        "url": "http://example.com/2",
+        "id": "2",
+        "title": "Bad Python Job",
+        "description": "This is a scam job."
+    })
+
+    # Login
+    client.post('/login', data={'username': username, 'password': 'password'})
+
+    # Set negative keywords
+    set_user_negative_keywords(username, ["scam"])
+
+    # Fetch jobs
+    resp = client.get('/jobs')
+    data = resp.get_json()
+
+    titles = [j['title'] for j in data]
+    assert "Good Python Job" in titles
+    assert "Bad Python Job" not in titles