From 7ecb1334506cab470399d9f493e5d8a651c9c2cc Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@archive.org>
Date: Wed, 4 Apr 2018 13:31:25 -0700
Subject: refactor out some common code

---
 mapreduce/common.py | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 mapreduce/common.py

(limited to 'mapreduce/common.py')

diff --git a/mapreduce/common.py b/mapreduce/common.py
new file mode 100644
index 0000000..65b2744
--- /dev/null
+++ b/mapreduce/common.py
@@ -0,0 +1,71 @@
+
+from datetime import datetime
+
+NORMAL_MIME = (
+    'application/pdf',
+    'application/postscript',
+    'text/html',
+    'text/xml',
+)
+
+def normalize_mime(raw):
+    raw = raw.lower()
+    for norm in NORMAL_MIME:
+        if raw.startswith(norm):
+            return norm
+
+    # Special cases 
+    if raw.startswith('application/xml'):
+        return 'text/xml'
+    if raw.startswith('application/x-pdf'):
+        return 'application/pdf'
+    return None
+
+
+def test_normalize_mime():
+    assert normalize_mime("asdf") == None
+    assert normalize_mime("application/pdf") == "application/pdf"
+    assert normalize_mime("application/pdf+journal") == "application/pdf"
+    assert normalize_mime("Application/PDF") == "application/pdf"
+    assert normalize_mime("application/p") == None
+    assert normalize_mime("application/xml+stuff") == "text/xml"
+
+
+def parse_cdx_line(raw_cdx):
+
+    cdx = raw_cdx.split()
+    if len(cdx) < 11:
+        return None
+
+    surt = cdx[0]
+    dt = cdx[1]
+    url = cdx[2]
+    mime = normalize_mime(cdx[3])
+    http_status = cdx[4]
+    key = cdx[5]
+    c_size = cdx[8]
+    offset = cdx[9]
+    warc = cdx[10]
+
+    if not (key.isalnum() and c_size.isdigit() and offset.isdigit()
+            and http_status == "200" and len(key) == 32 and dt.isdigit()
+            and mime != None):
+        return None
+
+    if '-' in (surt, dt, url, mime, http_status, key, c_size, offset, warc):
+        return None
+
+    key = "sha1:{}".format(key)
+
+    info = dict(surt=surt, dt=dt, url=url, c_size=int(c_size),
+        offset=int(offset), warc=warc)
+
+    warc_file = warc.split('/')[-1]
+    try:
+        dt_iso = datetime.strptime(dt, "%Y%m%d%H%M%S").isoformat()
+    except:
+        return None
+
+    # 'i' intentionally not set
+    heritrix = dict(u=url, d=dt_iso, f=warc_file, o=int(offset), c=1)
+    return {'key': key, 'file:mime': mime, 'file:cdx': info, 'f:c': heritrix}
-- 
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