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annotate core/management/commands/ssl_images.py @ 896:0054a4a88c1c

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Remove checking for https availability. This seems to take quite a while, plus Python doesn't validate the cert, so we could end up with dodgy sites.
author Brian Neal <bgneal@gmail.com>
date Wed, 25 Feb 2015 21:09:41 -0600
parents e7c549e4dbf7
children 49ebeb54990a
rev   line source
bgneal@859 1 """
bgneal@859 2 ssl_images is a custom manage.py command to convert forum post and comment
bgneal@859 3 images to https. It does this by rewriting the markup:
bgneal@859 4 - Images with src = http://surfguitar101.com/something are rewritten to be
bgneal@859 5 /something.
bgneal@859 6 - Non SG101 images that use http: are downloaded, resized, and uploaded to
bgneal@859 7 an S3 bucket. The src attribute is replaced with the new S3 URL.
bgneal@859 8 """
bgneal@882 9 import base64
bgneal@895 10 import datetime
bgneal@859 11 import logging
bgneal@859 12 from optparse import make_option
bgneal@888 13 import os
bgneal@863 14 import re
bgneal@863 15 import signal
bgneal@881 16 import socket
bgneal@881 17 import urllib
bgneal@868 18 import urlparse
bgneal@881 19 import uuid
bgneal@859 20
bgneal@859 21 from django.core.management.base import NoArgsCommand, CommandError
bgneal@859 22 from django.conf import settings
bgneal@894 23 from lxml import etree
bgneal@863 24 import markdown.inlinepatterns
bgneal@881 25 from PIL import Image
bgneal@859 26
bgneal@860 27 from comments.models import Comment
bgneal@860 28 from forums.models import Post
bgneal@881 29 from core.s3 import S3Bucket
bgneal@860 30
bgneal@860 31
bgneal@859 32 LOGFILE = os.path.join(settings.PROJECT_PATH, 'logs', 'ssl_images.log')
bgneal@859 33 logger = logging.getLogger(__name__)
bgneal@859 34
bgneal@871 35 IMAGE_LINK_RE = re.compile(markdown.inlinepatterns.IMAGE_LINK_RE,
bgneal@871 36 re.DOTALL | re.UNICODE)
bgneal@871 37 IMAGE_REF_RE = re.compile(markdown.inlinepatterns.IMAGE_REFERENCE_RE,
bgneal@871 38 re.DOTALL | re.UNICODE)
bgneal@863 39
bgneal@868 40 SG101_HOSTS = set(['www.surfguitar101.com', 'surfguitar101.com'])
bgneal@866 41 MODEL_CHOICES = ['comments', 'posts']
bgneal@866 42
bgneal@881 43 PHOTO_MAX_SIZE = (660, 720)
bgneal@881 44 PHOTO_BASE_URL = 'https://s3.amazonaws.com/'
bgneal@881 45 PHOTO_BUCKET_NAME = 'sg101.forum.photos'
bgneal@881 46
bgneal@863 47 quit_flag = False
bgneal@881 48 opener = None
bgneal@881 49 bucket = None
bgneal@881 50 url_cache = {}
bgneal@863 51
bgneal@863 52
bgneal@863 53 def signal_handler(signum, frame):
bgneal@863 54 """SIGINT signal handler"""
bgneal@863 55 global quit_flag
bgneal@863 56 quit_flag = True
bgneal@863 57
bgneal@859 58
bgneal@859 59 def _setup_logging():
bgneal@859 60 logger.setLevel(logging.DEBUG)
bgneal@859 61 logger.propagate = False
bgneal@859 62 handler = logging.FileHandler(filename=LOGFILE, encoding='utf-8')
bgneal@859 63 formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
bgneal@859 64 handler.setFormatter(formatter)
bgneal@859 65 logger.addHandler(handler)
bgneal@859 66
bgneal@859 67
bgneal@881 68 class ImageURLopener(urllib.FancyURLopener):
bgneal@881 69 """Our URL opener. Handles redirects as per FancyURLopener. But all other
bgneal@881 70 errors and authentication requests will raise an IOError.
bgneal@881 71 """
bgneal@881 72 HANDLED_ERRORS = set([302, 301, 303, 307])
bgneal@881 73
bgneal@881 74 def http_error_default(self, url, fp, errcode, errmsg, headers):
bgneal@881 75 return urllib.URLopener.http_error_default(self, url, fp, errcode,
bgneal@881 76 errmsg, headers)
bgneal@881 77
bgneal@881 78 def http_error(self, url, fp, errcode, errmsg, headers, data=None):
bgneal@881 79 """Handle http errors.
bgneal@881 80 We let FancyURLopener handle the redirects, but any other error we want
bgneal@881 81 to let fail.
bgneal@881 82 """
bgneal@881 83 if errcode in self.HANDLED_ERRORS:
bgneal@881 84 name = 'http_error_%d' % errcode
bgneal@881 85 method = getattr(self, name)
bgneal@881 86 if data is None:
bgneal@881 87 result = method(url, fp, errcode, errmsg, headers)
bgneal@881 88 else:
bgneal@881 89 result = method(url, fp, errcode, errmsg, headers, data)
bgneal@881 90 if result:
bgneal@881 91 return result
bgneal@881 92 return self.http_error_default(url, fp, errcode, errmsg, headers)
bgneal@881 93
bgneal@881 94
bgneal@881 95 def download_image(src):
bgneal@881 96 """Downloads the image file from the given source URL.
bgneal@881 97
bgneal@881 98 If successful returns the path to the downloaded file. Otherwise None is
bgneal@881 99 returned.
bgneal@881 100 """
bgneal@881 101 logger.info("Retrieving %s", src)
bgneal@881 102 try:
bgneal@881 103 fn, hdrs = opener.retrieve(src)
bgneal@881 104 except IOError as ex:
bgneal@881 105 args = ex.args
bgneal@881 106 if len(args) == 4 and args[0] == 'http error':
bgneal@881 107 logger.error("http error: %d - %s", args[1], args[2])
bgneal@881 108 else:
bgneal@881 109 logger.error("%s", ex)
bgneal@881 110 return None
bgneal@881 111
bgneal@881 112 # Does it look like an image?
bgneal@881 113 content_type = hdrs.get('content-type')
bgneal@881 114 if not content_type:
bgneal@881 115 logger.error("No content-type header found")
bgneal@881 116 return None
bgneal@881 117
bgneal@888 118 file_size = os.stat(fn).st_size
bgneal@888 119 logger.info("Retrieved: %s bytes; content-type: %s", file_size, content_type)
bgneal@881 120
bgneal@881 121 parts = content_type.split('/')
bgneal@881 122 if len(parts) < 2 or parts[0] != 'image':
bgneal@881 123 logger.error("Unknown content-type: %s", content_type)
bgneal@881 124 return None
bgneal@881 125
bgneal@881 126 return fn
bgneal@881 127
bgneal@881 128
bgneal@881 129 def resize_image(img_path):
bgneal@881 130 """Resizes the image found at img_path if necessary."""
bgneal@881 131 image = Image.open(img_path)
bgneal@881 132 if image.size > PHOTO_MAX_SIZE:
bgneal@881 133 logger.info('Resizing from %s to %s', image.size, PHOTO_MAX_SIZE)
bgneal@881 134 image.thumbnail(PHOTO_MAX_SIZE, Image.ANTIALIAS)
bgneal@881 135 image.save(img_path)
bgneal@881 136
bgneal@881 137
bgneal@882 138 def gen_key():
bgneal@882 139 """Return a random key."""
bgneal@882 140 return base64.b64encode(uuid.uuid4().bytes, '-_').rstrip('=')
bgneal@882 141
bgneal@882 142
bgneal@881 143 def upload_image(img_path):
bgneal@881 144 """Upload image file located at img_path to our S3 bucket.
bgneal@881 145
bgneal@881 146 Returns the URL of the image in the bucket or None if an error occurs.
bgneal@881 147 """
bgneal@881 148 logger.info("upload_image starting")
bgneal@881 149 # Make a unique name for the image in the bucket
bgneal@881 150 ext = os.path.splitext(img_path)[1]
bgneal@882 151 file_key = gen_key() + ext
bgneal@881 152 try:
bgneal@881 153 return bucket.upload_from_filename(file_key, img_path, public=True)
bgneal@881 154 except IOError as ex:
bgneal@881 155 logger.error("Error uploading file: %s", ex)
bgneal@881 156 return None
bgneal@881 157
bgneal@881 158
bgneal@888 159 def convert_to_ssl(parsed_url):
bgneal@888 160 """Top-level function for moving an image to SSL."""
bgneal@888 161
bgneal@888 162 src = parsed_url.geturl()
bgneal@888 163
bgneal@888 164 # Check the cache first
bgneal@888 165 new_url = url_cache.get(src)
bgneal@888 166 if new_url:
bgneal@888 167 logger.info("Found URL in cache: %s => %s", src, new_url)
bgneal@888 168 return new_url
bgneal@888 169
bgneal@896 170 # Try to download and upload to our S3 bucket
bgneal@889 171 new_url = save_image_to_cloud(src)
bgneal@889 172 if new_url:
bgneal@889 173 url_cache[src] = new_url
bgneal@889 174 return new_url
bgneal@888 175
bgneal@888 176
bgneal@868 177 def save_image_to_cloud(src):
bgneal@881 178 """Downloads an image at a given source URL. Uploads it to cloud storage.
bgneal@881 179
bgneal@881 180 Returns the new URL or None if unsuccessful.
bgneal@881 181 """
bgneal@881 182 fn = download_image(src)
bgneal@881 183 if fn:
bgneal@881 184 resize_image(fn)
bgneal@889 185 return upload_image(fn)
bgneal@881 186 return None
bgneal@868 187
bgneal@868 188
bgneal@866 189 def replace_image_markup(match):
bgneal@870 190 src_parts = match.group(8).split()
bgneal@868 191 if src_parts:
bgneal@868 192 src = src_parts[0]
bgneal@868 193 if src[0] == "<" and src[-1] == ">":
bgneal@868 194 src = src[1:-1]
bgneal@868 195 else:
bgneal@868 196 src = ''
bgneal@868 197
bgneal@868 198 title = ''
bgneal@868 199 if len(src_parts) > 1:
bgneal@868 200 title = " ".join(src_parts[1:])
bgneal@870 201 alt = match.group(1)
bgneal@868 202
bgneal@871 203 new_src = None
bgneal@868 204 if src:
bgneal@868 205 r = urlparse.urlparse(src)
bgneal@871 206 if r.hostname in SG101_HOSTS:
bgneal@871 207 new_src = r.path # convert to relative path
bgneal@871 208 elif r.scheme == 'http':
bgneal@888 209 # Try a few things to get this on ssl:
bgneal@888 210 new_src = convert_to_ssl(r)
bgneal@868 211 elif r.scheme == 'https':
bgneal@868 212 new_src = src # already https, accept it as-is
bgneal@868 213
bgneal@868 214 if new_src:
bgneal@868 215 if title:
bgneal@871 216 s = u'![{alt}]({src} {title})'.format(alt=alt, src=new_src, title=title)
bgneal@868 217 else:
bgneal@868 218 s = u'![{alt}]({src})'.format(alt=alt, src=new_src)
bgneal@868 219 else:
bgneal@868 220 # something's messed up, convert to a link using original src
bgneal@868 221 s = u'[{alt}]({src})'.format(alt=alt, src=src)
bgneal@868 222
bgneal@868 223 return s
bgneal@860 224
bgneal@860 225
bgneal@887 226 def warn_if_image_refs(text, model_name, pk):
bgneal@887 227 """Search text for Markdown image reference markup.
bgneal@887 228
bgneal@887 229 We aren't expecting these, but we will log something if we see any.
bgneal@887 230 """
bgneal@887 231 if IMAGE_REF_RE.search(text):
bgneal@887 232 logger.warning("Image reference found in %s pk = #%d", model_name, pk)
bgneal@887 233
bgneal@887 234
bgneal@866 235 def process_post(text):
bgneal@863 236 """Process the post object:
bgneal@863 237
bgneal@863 238 A regex substitution is run on the post's text field. This fixes up image
bgneal@863 239 links, getting rid of plain old http sources; either converting to https
bgneal@863 240 or relative style links (if the link is to SG101).
bgneal@863 241
bgneal@863 242 """
bgneal@866 243 return IMAGE_LINK_RE.sub(replace_image_markup, text)
bgneal@863 244
bgneal@863 245
bgneal@894 246 def html_check(html):
bgneal@894 247 """Return True if the given HTML fragment has <img> tags with src attributes
bgneal@894 248 that use http, and False otherwise.
bgneal@894 249 """
bgneal@894 250 if not html:
bgneal@894 251 return False
bgneal@894 252
bgneal@894 253 root = etree.HTML(html)
bgneal@894 254 for img in root.iter('img'):
bgneal@894 255 src = img.get('src')
bgneal@894 256 if src and src.lower().startswith('http:'):
bgneal@894 257 return True
bgneal@894 258 return False
bgneal@894 259
bgneal@894 260
bgneal@859 261 class Command(NoArgsCommand):
bgneal@859 262 help = "Rewrite forum posts and comments to not use http for images"
bgneal@859 263 option_list = NoArgsCommand.option_list + (
bgneal@866 264 make_option('-m', '--model',
bgneal@866 265 choices=MODEL_CHOICES,
bgneal@866 266 help="which model to update; must be one of {{{}}}".format(
bgneal@866 267 ', '.join(MODEL_CHOICES))),
bgneal@860 268 make_option('-i', '--i',
bgneal@859 269 type='int',
bgneal@863 270 help="optional first slice index; the i in [i:j]"),
bgneal@860 271 make_option('-j', '--j',
bgneal@859 272 type='int',
bgneal@863 273 help="optional second slice index; the j in [i:j]"),
bgneal@859 274 )
bgneal@859 275
bgneal@859 276 def handle_noargs(self, **options):
bgneal@895 277 time_started = datetime.datetime.now()
bgneal@859 278 _setup_logging()
bgneal@860 279 logger.info("Starting; arguments received: %s", options)
bgneal@859 280
bgneal@866 281 if options['model'] not in MODEL_CHOICES:
bgneal@866 282 raise CommandError('Please choose a --model option')
bgneal@859 283
bgneal@866 284 if options['model'] == 'comments':
bgneal@860 285 qs = Comment.objects.all()
bgneal@866 286 text_attr = 'comment'
bgneal@881 287 model_name = 'Comment'
bgneal@860 288 else:
bgneal@860 289 qs = Post.objects.all()
bgneal@866 290 text_attr = 'body'
bgneal@881 291 model_name = 'Post'
bgneal@860 292
bgneal@860 293 i, j = options['i'], options['j']
bgneal@860 294
bgneal@860 295 if i is not None and i < 0:
bgneal@860 296 raise CommandError("-i must be >= 0")
bgneal@860 297 if j is not None and j < 0:
bgneal@860 298 raise CommandError("-j must be >= 0")
bgneal@860 299 if j is not None and i is not None and j <= i:
bgneal@860 300 raise CommandError("-j must be > -i")
bgneal@860 301
bgneal@860 302 if i is not None and j is not None:
bgneal@860 303 qs = qs[i:j]
bgneal@860 304 elif i is not None and j is None:
bgneal@860 305 qs = qs[i:]
bgneal@860 306 elif i is None and j is not None:
bgneal@860 307 qs = qs[:j]
bgneal@860 308
bgneal@881 309 # Set global socket timeout
bgneal@881 310 socket.setdefaulttimeout(30)
bgneal@881 311
bgneal@863 312 # Install signal handler for ctrl-c
bgneal@863 313 signal.signal(signal.SIGINT, signal_handler)
bgneal@863 314
bgneal@881 315 # Create URL opener to download photos
bgneal@881 316 global opener
bgneal@881 317 opener = ImageURLopener()
bgneal@881 318
bgneal@881 319 # Create bucket to upload photos
bgneal@881 320 global bucket
bgneal@881 321 bucket = S3Bucket(access_key=settings.USER_PHOTOS_ACCESS_KEY,
bgneal@881 322 secret_key=settings.USER_PHOTOS_SECRET_KEY,
bgneal@881 323 base_url=PHOTO_BASE_URL,
bgneal@881 324 bucket_name=PHOTO_BUCKET_NAME)
bgneal@887 325
bgneal@887 326 if i is None:
bgneal@887 327 i = 0
bgneal@887 328
bgneal@895 329 count = 0
bgneal@881 330 for n, model in enumerate(qs.iterator()):
bgneal@863 331 if quit_flag:
bgneal@863 332 logger.warning("SIGINT received, exiting")
bgneal@881 333 break
bgneal@881 334 logger.info("Processing %s #%d (pk = %d)", model_name, n + i, model.pk)
bgneal@866 335 txt = getattr(model, text_attr)
bgneal@887 336 warn_if_image_refs(txt, model_name, model.pk)
bgneal@866 337 new_txt = process_post(txt)
bgneal@881 338 if txt != new_txt:
bgneal@889 339 logger.info("Content changed on %s #%d (pk = %d)",
bgneal@887 340 model_name, n + i, model.pk)
bgneal@881 341 logger.debug("original: %s", txt)
bgneal@881 342 logger.debug("changed: %s", new_txt)
bgneal@887 343 setattr(model, text_attr, new_txt)
bgneal@887 344 model.save()
bgneal@894 345 elif html_check(model.html):
bgneal@894 346 # Check for content generated with older smiley code that used
bgneal@894 347 # absolute URLs for the smiley images. If True, then just save
bgneal@894 348 # the model again to force updated HTML to be created.
bgneal@894 349 logger.info("Older Smiley HTML detected, forcing a save")
bgneal@894 350 model.save()
bgneal@895 351 count += 1
bgneal@860 352
bgneal@895 353 time_finished = datetime.datetime.now()
bgneal@895 354 elapsed = time_finished - time_started
bgneal@895 355 logger.info("ssl_images exiting; number of objects: %d; elapsed: %s",
bgneal@895 356 count, elapsed)