split_markdown_front_matter: Do not strip lines

spaces are important, otherwise it would fail to produce a valid
yaml front matter in case of
https://raw.githubusercontent.com/mozilla/foundation-security-advisories/master/announce/2012/mfsa2012-85.md
Anyway, line shouldn't be altered in a splitter.

Signed-off-by: Hritik Vijay <hritikxx8@gmail.com>

vulnerabilities/helpers.py

@@ -79,11 +79,10 @@ def create_etag(data_src, url, etag_key):
     return True
 
 
-def split_markdown_front_matter(lines: Iterable) -> Tuple[str, str]:
+def split_markdown_front_matter(lines: str) -> Tuple[str, str]:
     """
     This function splits lines into markdown front matter and the markdown body
     and returns list of lines for both
-    NOTE: lines is expected to be an iterable containing strings
 
     for example :
         lines =
@@ -94,7 +93,7 @@ def split_markdown_front_matter(lines: Iterable) -> Tuple[str, str]:
         ---
         # Markdown starts here
 
-    get_markdown_front_matter(lines) would return
+    split_markdown_front_matter(lines) would return
     ['title: ISTIO-SECURITY-2019-001','description: Incorrect access control.'
     ,'cves: [CVE-2019-12243]'],
     ["# Markdown starts here"]
@@ -104,11 +103,10 @@ def split_markdown_front_matter(lines: Iterable) -> Tuple[str, str]:
     mdlines = []
     splitter = mdlines
 
-    for index, line in enumerate(lines):
-        line = line.strip()
-        if index == 0 and line.startswith("---"):
+    for index, line in enumerate(lines.split("\n")):
+        if index == 0 and line.strip().startswith("---"):
             splitter = fmlines
-        elif line.startswith("---"):
+        elif line.strip().startswith("---"):
             splitter = mdlines
         else:
             splitter.append(line)

vulnerabilities/importers/mozilla.py

@@ -81,7 +81,7 @@ def get_advisories_from_yml(self, mfsa_id, lines) -> List[Advisory]:
         return advisories
 
     def get_advisories_from_md(self, mfsa_id, lines) -> List[Advisory]:
-        yamltext, mdtext = split_markdown_front_matter(lines)
+        yamltext, mdtext = split_markdown_front_matter(lines.read())
         data = yaml.safe_load(yamltext)
         data["mfsa_id"] = mfsa_id