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#!/usr/bin/python3
import sys, re, os
import sqlite3
import urllib.parse, requests
import time, signal
usageInfo = f"usage: {sys.argv[0]}\n"
usageInfo += "Downloads images from URLs specified in an sqlite db,\n"
usageInfo += "into a specified directory.'\n"
usageInfo += "\n"
usageInfo += "SIGINT causes the program to finish an ongoing download and exit.\n"
usageInfo += "The program can be re-run to continue downloading, and looks\n"
usageInfo += "in the output directory do decide what to skip.\n"
if len(sys.argv) > 1:
print(usageInfo, file=sys.stderr)
sys.exit(1)
imgDb = "enwikiImgs.db" # About 130k image names
outDir = "imgs"
licenseRegex = re.compile(r"cc0|cc([ -]by)?([ -]sa)?([ -][1234]\.[05])?( \w\w\w?)?", flags=re.IGNORECASE)
# Create output directory if not present
if not os.path.exists(outDir):
os.mkdir(outDir)
# Get existing image names
print("Gettings already-downloaded images")
fileList = os.listdir(outDir)
pageIdsDone = set()
for filename in fileList:
(basename, extension) = os.path.splitext(filename)
pageIdsDone.add(int(basename))
print(f"Found {len(pageIdsDone)} already-downloaded images")
# Set SIGINT handler
interrupted = False
oldHandler = None
def onSigint(sig, frame):
global interrupted
interrupted = True
signal.signal(signal.SIGINT, oldHandler)
oldHandler = signal.signal(signal.SIGINT, onSigint)
# Open db
dbCon = sqlite3.connect(imgDb)
dbCur = dbCon.cursor()
# Start downloads
print("Starting downloads")
iterNum = 0
query = "SELECT page_id, license, artist, credit, restrictions, url FROM" \
" imgs INNER JOIN page_imgs ON imgs.name = page_imgs.img_name"
for (pageId, license, artist, credit, restrictions, url) in dbCur.execute(query):
if pageId in pageIdsDone:
continue
if interrupted:
print(f"Exiting loop")
break
# Check for problematic attributes
if license == None or licenseRegex.fullmatch(license) == None:
continue
if artist == None or artist == "" or len(artist) > 100 or re.match(r"(\d\. )?File:", artist) != None:
continue
if credit == None or len(credit) > 300 or re.match(r"File:", credit) != None:
continue
if restrictions != None and restrictions != "":
continue
# Download image
iterNum += 1
print(f"Iteration {iterNum}: Downloading for page-id {pageId}")
urlParts = urllib.parse.urlparse(url)
extension = os.path.splitext(urlParts.path)[1]
if len(extension) <= 1:
print(f"WARNING: No filename extension found in URL {url}", file=sys.stderr)
sys.exit(1)
outFile = f"{outDir}/{pageId}{extension}"
headers = {
"user-agent": "terryt.dev (terry06890@gmail.com)",
"accept-encoding": "gzip",
}
try:
response = requests.get(url, headers=headers)
with open(outFile, 'wb') as file:
file.write(response.content)
time.sleep(1)
# https://en.wikipedia.org/wiki/Wikipedia:Database_download says to "throttle self to 1 cache miss per sec"
# It's unclear how to properly check for cache misses, so just do about <=1 per sec
except Exception as e:
print(f"Error while downloading to {outFile}: {e}", file=sys.stderr)
# Close db
dbCon.close()
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