Simplify the code by using GitHub CLI

Simplify the code by using GitHub CLI and the GitHub REST API. Also add
tests.

Fixes #5

.cookiecutter/cookiecutter.json

@@ -2,7 +2,7 @@
   "template": "https://github.com/hypothesis/cookiecutters",
   "checkout": null,
   "directory": "pypackage",
-  "ignore": ["tests/unit/dependabot_alerts/core_test.py"],
+  "ignore": ["tests/functional/sanity_test.py"],
   "extra_context": {
     "name": "Dependabot Alerts",
     "package_name": "dependabot_alerts",

.cookiecutter/includes/README/head.md

@@ -1,10 +1,12 @@
 `dependabot-alerts` lists Dependabot security alerts for all repos of a GitHub
-user or organization. You can run it from the command line:
+organization. You can run it from the command line:
 
 ```terminal
-$ dependabot-alerts <your_github_user_or_organization>
+$ dependabot-alerts <your_github_organization>
 ```
 
+You'll need to have [GitHub CLI](https://cli.github.com/) installed and logged in.
+
 There's also a [GitHub Actions workflow](.github/workflows/alert.yml) that runs
 automatically on a schedule and notifies us in Slack of any Dependabot alerts
 in the `hypothesis` GitHub organization.

.github/workflows/alert.yml

@@ -29,7 +29,7 @@ jobs:
         run: |
           {
             echo 'SLACK_MESSAGE<<EOF'
-            dependabot-alerts hypothesis
+            dependabot-alerts --format slack hypothesis
             echo EOF
           } >> "$GITHUB_OUTPUT"
         env:

README.md

@@ -9,12 +9,14 @@
 Notifications of Dependabot alerts across a GitHub organization.
 
 `dependabot-alerts` lists Dependabot security alerts for all repos of a GitHub
-user or organization. You can run it from the command line:
+organization. You can run it from the command line:
 
 ```terminal
-$ dependabot-alerts <your_github_user_or_organization>
+$ dependabot-alerts <your_github_organization>
 ```
 
+You'll need to have [GitHub CLI](https://cli.github.com/) installed and logged in.
+
 There's also a [GitHub Actions workflow](.github/workflows/alert.yml) that runs
 automatically on a schedule and notifies us in Slack of any Dependabot alerts
 in the `hypothesis` GitHub organization.

setup.cfg

@@ -18,7 +18,6 @@ package_dir =
 packages = find:
 python_requires = >=3.11
 install_requires =
-    requests
 
 [options.packages.find]
 where = src

src/dependabot_alerts/cli.py

@@ -1,49 +1,32 @@
+import subprocess
 from argparse import ArgumentParser
 from importlib.metadata import version
 
-from dependabot_alerts.core import GitHubClient, Vulnerability, fetch_alerts
+from dependabot_alerts.core import GitHub
+from dependabot_alerts.format import format_slack, format_text
 
 
-def cli(_argv=None):  # pragma: no cover
+def cli(argv=None):
     parser = ArgumentParser()
     parser.add_argument(
         "-v", "--version", action="version", version=version("dependabot-alerts")
     )
-    parser.add_argument("organization", help="GitHub user or organization")
-
-    args = parser.parse_args(_argv)
-
-    gh_client = GitHubClient.init()
-    vulns = fetch_alerts(gh_client, args.organization)
-    print(format_slack_message(args.organization, vulns))
-
-    return 0
-
-
-def format_slack_message(
-    organization: str, vulns: list[Vulnerability]
-) -> str:  # pragma: no cover
-    """
-    Format a Slack status report from a list of vulnerabilities.
+    parser.add_argument(
+        "--format", choices=["text", "slack"], default="text", help="output format"
+    )
+    parser.add_argument("organization", help="GitHub organization")
+    args = parser.parse_args(argv)
 
-    Returns a message using Slack's "mrkdwn" format. See
-    https://api.slack.com/reference/surfaces/formatting.
-    """
-    if not vulns:
-        return "Found no open vulnerabilities."
+    alerts = GitHub(subprocess.run).alerts(args.organization)
 
-    n_repos = len(set(vuln.repo for vuln in vulns))
+    formatters = {
+        "text": format_text,
+        "slack": format_slack,
+    }
 
-    msg_parts = []
-    msg_parts.append(f"*Found {len(vulns)} vulnerabilities in {n_repos} repositories.*")
+    formatter = formatters[args.format]
 
-    for vuln in vulns:
-        vuln_msg = []
-        vuln_msg.append(
-            f"{organization}/{vuln.repo}: <{vuln.url}|{vuln.package_name} {vuln.severity} - {vuln.title}>"
-        )
-        if vuln.pr:
-            vuln_msg.append(f"  Resolved by {vuln.pr}")
-        msg_parts.append("\n".join(vuln_msg))
+    output = formatter(alerts, args.organization)
 
-    return "\n\n".join(msg_parts)
+    if output:
+        print(output)

src/dependabot_alerts/core.py

@@ -1,184 +1,65 @@
-import json
-import os
-from dataclasses import dataclass
-from getpass import getpass
-from typing import Optional
-
-import requests
-
-
-class GitHubClient:  # pragma: no cover
-    """
-    Client for GitHub's GraphQL API.
+from __future__ import annotations
 
-    See https://docs.github.com/en/graphql.
-    """
+import json
+from dataclasses import dataclass, field
+from subprocess import CalledProcessError
 
-    def __init__(self, token):
-        self.token = token
-        self.endpoint = "https://api.github.com/graphql"
 
-    def query(self, query, variables=None):
-        data = {"query": query, "variables": variables if variables is not None else {}}
-        result = requests.post(
-            url=self.endpoint,
-            headers={"Authorization": f"Bearer {self.token}"},
-            data=json.dumps(data),
-            timeout=(30, 30),
-        )
-        body = result.json()
-        result.raise_for_status()
-        if "errors" in body:
-            errors = body["errors"]
-            raise RuntimeError(f"Query failed: {json.dumps(errors)}")
-        return body["data"]
+@dataclass(frozen=True)
+class Alert:  # pylint:disable=too-many-instance-attributes
+    repo_full_name: str | None
+    ghsa_id: str | None
+    html_url: str | None = field(compare=False)
+    package: str | None = field(compare=False)
+    manifest_path: str | None = field(compare=False)
+    summary: str | None = field(compare=False)
+    severity: str | None = field(compare=False)
+    duplicates: list[Alert] = field(compare=False, default_factory=list)
 
     @classmethod
-    def init(cls):
-        """
-        Initialize an authenticated GitHubClient.
-
-        This will read from the `GITHUB_TOKEN` env var if set, or prompt for
-        a token otherwise.
-        """
-        access_token = os.environ.get("GITHUB_TOKEN")
-        if not access_token:
-            access_token = getpass("GitHub API token: ")
-        return GitHubClient(access_token)
-
-
-@dataclass
-class Vulnerability:  # pylint:disable=too-many-instance-attributes
-    repo: str
-    """Repository where this vulnerability was reported."""
-
-    created_at: str
-    """ISO date when this alert was created."""
-
-    package_name: str
-    """Name of the vulnerable package."""
-
-    ecosystem: str
-    """Package ecosytem (eg. npm) that the package comes from."""
-
-    severity: str
-    """Vulnerability severity level."""
-
-    version_range: str
-    """Version ranges of package affected by vulnerability."""
-
-    number: str
-    """Number of this vulnerability report."""
-
-    url: str
-    """Link to the vulernability report on GitHub."""
-
-    pr: Optional[str]
-    """Link to the Dependabot update PR that resolves this vulnerability."""
-
-    title: str
-    """Summary of what the vulnerability is."""
-
-
-def fetch_alerts(
-    gh: GitHubClient, organization: str
-) -> list[Vulnerability]:  # pragma: no cover
-    """
-    Fetch details of all open vulnerability alerts in `organization`.
-
-    To reduce the volume of noise, especially for repositories which include the
-    same dependency in multiple lockfiles, only one vulnerability is reported
-    per package per repository.
-
-    Vulnerabilities are not reported from archived repositories.
-    """
-    # pylint:disable=too-many-locals
-
-    query = """
-query($organization: String!, $cursor: String) {
-  organization(login: $organization) {
-    repositories(first: 100, after: $cursor) {
-      pageInfo {
-        endCursor
-        hasNextPage
-      }
-      nodes {
-        name
-        vulnerabilityAlerts(first: 100, states:OPEN) {
-          nodes {
-            number
-            createdAt
-            dependabotUpdate {
-              pullRequest {
-                url
-              }
-            }
-            securityAdvisory {
-              summary
-            }
-            securityVulnerability {
-              package {
-                name
-                ecosystem
-              }
-              severity
-              vulnerableVersionRange
-            }
-          }
-        }
-      }
-    }
-  }
-}
-"""
-
-    vulns = []
-    cursor = None
-    has_next_page = True
-
-    while has_next_page:
-        result = gh.query(
-            query=query, variables={"organization": organization, "cursor": cursor}
+    def make(cls, alert_dict):
+        return cls(
+            repo_full_name=alert_dict["repository"]["full_name"],
+            ghsa_id=alert_dict["security_advisory"]["ghsa_id"],
+            html_url=alert_dict["html_url"],
+            package=alert_dict["dependency"]["package"]["name"],
+            manifest_path=alert_dict["dependency"]["manifest_path"],
+            summary=alert_dict["security_advisory"]["summary"],
+            severity=alert_dict["security_advisory"]["severity"],
         )
-        page_info = result["organization"]["repositories"]["pageInfo"]
-        cursor = page_info["endCursor"]
-        has_next_page = page_info["hasNextPage"]
-
-        for repo in result["organization"]["repositories"]["nodes"]:
-            alerts = repo["vulnerabilityAlerts"]["nodes"]
-
-            if alerts:
-                repo_name = repo["name"]
-                vulnerable_packages = set()
-
-                for alert in alerts:
-                    sa = alert["securityAdvisory"]
-                    sv = alert["securityVulnerability"]
-                    number = alert["number"]
-                    package_name = sv["package"]["name"]
-
-                    if package_name in vulnerable_packages:
-                        continue
-                    vulnerable_packages.add(package_name)
-
-                    pr = None
-
-                    dep_update = alert["dependabotUpdate"]
-                    if dep_update and dep_update["pullRequest"]:
-                        pr = dep_update["pullRequest"]["url"]
 
-                    vuln = Vulnerability(
-                        repo=repo_name,
-                        created_at=alert["createdAt"],
-                        ecosystem=sv["package"]["ecosystem"],
-                        number=number,
-                        package_name=sv["package"]["name"],
-                        pr=pr,
-                        severity=sv["severity"],
-                        title=sa["summary"],
-                        url=f"https://github.com/{organization}/{repo_name}/security/dependabot/{number}",
-                        version_range=sv["vulnerableVersionRange"],
-                    )
-                    vulns.append(vuln)
 
-    return vulns
+class GitHub:
+    def __init__(self, run):
+        self._run = run
+
+    def alerts(self, organization) -> list[Alert]:
+        try:
+            result = self._run(
+                [
+                    "gh",
+                    "api",
+                    "--paginate",
+                    f"/orgs/{organization}/dependabot/alerts?state=open",
+                ],
+                check=True,
+                capture_output=True,
+                text=True,
+            )
+        except CalledProcessError as err:  # pragma: no cover
+            print(err.stdout)
+            print(err.stderr)
+            raise
+
+        alert_dicts = json.loads(result.stdout)
+
+        alerts = {}
+
+        for alert_dict in alert_dicts:
+            alert = Alert.make(alert_dict)
+            if alert in alerts:
+                alerts[alert].duplicates.append(alert)
+            else:
+                alerts[alert] = alert
+
+        return list(alerts.values())