Added GitHub actions to validate issue number in PR bodies (#1001)

* Added GitHub actions to validate issue number in PR bodies

* Added requested changes

* Added picture link to the invalid-comment body

Author: XZANATOL

.github/actions/PR_has_a_valid_issue/Dockerfile

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+FROM python:3
+
+RUN pip install --no-cache-dir requests
+
+COPY . .
+
+CMD [ "python", "/main.py"]

.github/actions/PR_has_a_valid_issue/action.yml

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+name: "PR_has_a_valid_issue"
+
+description: "Checks for a valid Issue number linked with the PR"
+
+inputs:
+  prbody:
+    description: "The body of the PR to search for related issues"
+    required: true
+    
+  prurl:
+    description: "URL of the Pull Request"
+    required: true
+    
+outputs:
+  valid:
+    description: "code for a valid issue (0=Invalid, 1=Valid)"
+    
+runs:
+  using: "docker"
+  image: "Dockerfile"

.github/actions/PR_has_a_valid_issue/main.py

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+import os, re, requests
+
+# Used pattern to search for Issues.
+pattern = "#\d+"
+
+# PR body
+body = os.getenv("INPUT_PRBODY")
+# PR URL
+url  = os.getenv("INPUT_PRURL")
+
+issue_num = re.search(pattern, body)[0].replace("#", "")
+
+# url list will be something like this
+# ['https:', '', 'api.github.com', 'repos', 'owner', 'repo-name']
+# Split URL using slashes
+url = url.split("/")[:-2]
+# Replace API URL with HTML URL
+url[2] = url[2].replace("api.", "")
+# Get rid of "repos" record
+url.pop(3)
+# Reattach URL pieces
+url = "/".join(url)
+# Add issue number
+url += "/issues/{}".format(issue_num)
+
+# Is valid code
+valid_code = 0
+response = requests.get(url)
+# Check if not a 404 page
+if response.status_code == 200:
+    print("status code is 200")
+    # Check if not redirected to a pull request page
+    if response.url == url:
+        print("URLS are matched")
+        # Check if Issue is Open not Closed
+        text = response.text
+        pattern_issue = "Status:\s(\w+)"
+        if re.search(pattern_issue, text)[1] == "Open":
+            valid_code = 1
+        else:
+            print("Couldn't find Open flag")
+else:
+    print("Invalid Response Code obtained - error code: {}".format(response.status_code))
+
+print("Valid flag is:", valid_code)
+
+print(f"::set-output name=valid::{valid_code}")

.github/workflows/Check if issue exists.yml

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+name: PR has a valid Issue?
+
+on:
+  pull_request:
+    types: [ edited, synchronize, opened, reopened ]
+
+jobs:
+  checker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      
+      - name: "Issue number validator"
+        uses: ./.github/actions/PR_has_a_valid_issue/
+        id: validator
+        with:
+          prbody: ${{ github.event.pull_request.body }}
+          prurl: ${{ github.event.pull_request.url }}
+
+      - name: "Validation action on 1"
+        if: ${{ steps.validator.outputs.valid == 1 }}
+        run: |
+          echo $Github_Token > mytoken.txt
+          gh auth login --with-token < mytoken.txt
+          gh pr edit $PRNUM --add-label "PR:Ready-to-Review"
+          gh pr edit $PRNUM --remove-label "PR:No-Issue"
+          rm mytoken.txt
+        env:
+          Github_Token: ${{ secrets.GITHUB_TOKEN }}
+          PRNUM: ${{ github.event.pull_request.number }}
+
+      - name: "Validation action on 0"
+        if: ${{ steps.validator.outputs.valid == 0 }}
+        run: |
+          echo $Github_Token > mytoken.txt
+          gh auth login --with-token < mytoken.txt
+          gh pr comment $PRNUM --body "PR is not linked to any issue, please make the corresponding changes in the body. The issue should look like [this](https://ibb.co/Bg9x53w). For help follow this [link](https://github.com/HarshCasper/Rotten-Scripts/blob/master/CONTRIBUTING.md)"
+          gh pr edit $PRNUM --add-label "PR:No-Issue"
+          rm mytoken.txt
+        env:
+          Github_Token: ${{ secrets.GITHUB_TOKEN }}
+          PRNUM: ${{ github.event.pull_request.number }}