scrape multiple books from one url

core/loaders/doab_utils.py

@@ -124,6 +124,9 @@ def online_to_download(url):
         booknum = FRONTIERSIN.search(url).group(1)
         urls.append(u'https://www.frontiersin.org/GetFile.aspx?ebook={}&fileformat=EPUB'.format(booknum))
         urls.append(u'https://www.frontiersin.org/GetFile.aspx?ebook={}&fileformat=PDF'.format(booknum))
+    elif url.find(u'edp-open.org/books-in-') >= 0:
+        # pages needing multi-scrape
+        return urls
     else:
         urls.append(url)
     return urls

core/loaders/multiscrape.py

@@ -0,0 +1,94 @@
+import logging
+import re
+from urlparse import urljoin
+
+from bs4 import BeautifulSoup
+import requests
+
+from django.conf import settings
+
+from regluit.core.bookloader import add_from_bookdatas
+from regluit.core.loaders.scrape import BaseScraper
+from regluit.core.validation import identifier_cleaner
+
+logger = logging.getLogger(__name__)
+'''
+use for web pages with multiple books
+returns an iterator of scrapers
+'''
+        
+class BaseMultiScraper(BaseScraper):
+    def __init__(self, url, doc):
+        self.metadata = {}
+        self.identifiers = {'http': url}
+        self.doc = doc
+        self.base = url
+        self.get_all()
+        if not self.metadata.get('title', None):
+            self.set('title', '!!! missing title !!!')
+        if not self.metadata.get('language', None):
+            self.set('language', 'en')
+        self.metadata['identifiers'] = self.identifiers
+
+def multiscrape(url, divider, scraper_class=BaseMultiScraper):
+    try:
+        response = requests.get(url, headers={"User-Agent": settings.USER_AGENT})
+        if response.status_code == 200:
+            doc = BeautifulSoup(response.content, 'lxml')
+            sections = divider(doc)
+            for section in sections:
+                yield scraper_class(url, section)
+    except requests.exceptions.RequestException as e:
+        logger.error(e)
+        self.metadata = None
+
+
+# following is code specific to edp-open.org; refactor when we add another
+
+def divider(doc):
+    return doc.select('article.Bk')
+
+ISBNMATCH = re.compile(r'([\d\-]+)')
+class EDPMultiScraper(BaseMultiScraper):
+    def get_isbns(self):
+        '''return a dict of edition keys and ISBNs'''
+        isbns = {}
+        isbn_cleaner = identifier_cleaner('isbn', quiet=True)
+        labels = ['epub', 'pdf', 'paper']
+        info = self.doc.select_one('p.nfo').text
+        isbntexts = re.split('ISBN', info)
+        for isbntext in isbntexts[1:]:
+            isbnmatch = ISBNMATCH.search(isbntext)
+            if isbnmatch:
+                isbn = isbn_cleaner(isbnmatch.group(0))
+                isbns[labels.pop()] = isbn
+        return isbns
+
+    def get_downloads(self):
+        dl = self.doc.select_one('nav.dl')
+        links = dl.select('a.fulldl')
+        for link in links:
+            href = urljoin(self.base, link['href'])
+            if href.endswith('.pdf'):
+                self.set('download_url_pdf', href)
+            elif  href.endswith('.epub'):
+                self.set('download_url_epub', href)
+
+    def get_language(self):
+        self.set('language', 'fr')
+
+    def get_title(self):
+        value = self.doc.select_one('h2').text
+        book_id = self.doc.select_one('h2')['id']
+        self.identifiers['http'] = u'{}#{}'.format(self.base, book_id)
+        self.set('title', value)
+
+def edp_scrape():
+    edp_urls = [
+        'https://www.edp-open.org/books-in-french',
+        'https://www.edp-open.org/books-in-english',
+    ]
+    for url in edp_urls:
+        scrapers = multiscrape(url, divider, scraper_class=EDPMultiScraper)
+        add_from_bookdatas(scrapers)
+

core/loaders/scrape.py

@@ -51,19 +51,7 @@ class BaseScraper(object):
                 self.doc = BeautifulSoup(response.content, 'lxml')
                 for review in self.doc.find_all(itemtype="http://schema.org/Review"):
                     review.clear()
-                self.setup()
-                self.get_genre()
-                self.get_title()
-                self.get_language()
-                self.get_description()
-                self.get_identifiers()
-                self.get_keywords()
-                self.get_publisher()
-                self.get_pubdate()
-                self.get_authors()
-                self.get_cover()
-                self.get_downloads()
-                self.get_license()
+                self.get_all()
             if not self.metadata.get('title', None):
                 self.set('title', '!!! missing title !!!')
             if not self.metadata.get('language', None):
@@ -141,6 +129,21 @@ class BaseScraper(object):
                     value_list.append(el['content'])
         return value_list
                 
+    def get_all(self):
+        self.setup()
+        self.get_genre()
+        self.get_title()
+        self.get_language()
+        self.get_description()
+        self.get_identifiers()
+        self.get_keywords()
+        self.get_publisher()
+        self.get_pubdate()
+        self.get_authors()
+        self.get_cover()
+        self.get_downloads()
+        self.get_license()
+
     def setup(self):
         # use this method to get auxiliary resources based on doc
         pass

core/management/commands/load_edp.py

@@ -0,0 +1,10 @@
+from django.core.management.base import BaseCommand
+
+from regluit.core.loaders.multiscrape import edp_scrape
+
+
+class Command(BaseCommand):
+    help = "load books from edp-open"
+    
+    def handle(self, **options):
+        edp_scrape()