feat: add the core login for the action

Dockerfile

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+FROM python:3.7
+
+RUN pip install --no-cache-dir requests
+
+COPY . .
+
+CMD [ "python", "/main.py"]

action.yml

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+name: "Validate Issues over Pull Requests"
+description: "Checks for a valid Issue number linked with the PR"
+author: "Harsh Mishra"
+
+inputs:
+  prbody:
+    description: "Body of the Pull Request 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"

main.py

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+import os
+import re
+
+import requests
+
+
+def main():
+    """
+    Function to validate the Issue present over the Pull Request body.
+    """
+
+    pattern = "#\d+"
+
+    # Get the PR body and the PR URL
+    body = os.getenv("INPUT_PRBODY")
+    url = os.getenv("INPUT_PRURL")
+    print(body)
+    print(url)
+
+    # Get the Issue number
+    try:
+        issue_num = re.search(pattern, body)[0].replace("#", "")
+        print(issue_num)
+    except:
+        issue_num = "No issue number"
+
+    # URL List will match: ['https:', '', 'api.github.com', 'repos', 'owner', 'repo-name']
+    url = url.split("/")[:-2]
+    url[2] = url[2].replace("api.", "")
+
+    # Get rid of the repos record
+    url.pop(3)
+
+    # Reattach the URL pieces
+    url = "/".join(url)
+
+    # Add the issue number to the URL
+    url += "/issues/{}".format(issue_num)
+    print(url)
+
+    # Check if its valid code
+    valid_code = 0
+    response = requests.get(url)
+    if response.status_code == 200:
+        if response.url == url:
+            # Check if issue is open or closed
+            text = response.text
+            pattern_issue = "Status:\s(\w+)"
+            if re.search(pattern_issue, text)[1] == "Open":
+                valid_code = 1
+            else:
+                print("Issue is closed")
+    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}")
+
+
+if __name__ == "__main__":
+    main()