From 62e7aca0fb765545e4022172204ec377e6d80a4a Mon Sep 17 00:00:00 2001
From: Daniel <ge64tap@mytum.de>
Date: Tue, 25 Jan 2022 14:33:34 +0100
Subject: [PATCH] amazon metadata

---
 cps/metadata_provider/amazon.py | 98 +++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 cps/metadata_provider/amazon.py

diff --git a/cps/metadata_provider/amazon.py b/cps/metadata_provider/amazon.py
new file mode 100644
index 00000000..f7738387
--- /dev/null
+++ b/cps/metadata_provider/amazon.py
@@ -0,0 +1,98 @@
+import concurrent.futures
+import requests
+from bs4 import BeautifulSoup as BS  # requirement
+import lxml     #requirement for better speed
+import cchardet #optional for better speed
+from cps.services.Metadata import Metadata
+#from time import time
+from operator import itemgetter
+class Amazon(Metadata):
+    __name__ = "Amazon"
+    __id__ = "amazon"
+    headers = {'upgrade-insecure-requests': '1',
+               'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36',
+               'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
+               'sec-gpc': '1',
+               'sec-fetch-site': 'none',
+               'sec-fetch-mode': 'navigate',
+               'sec-fetch-user': '?1',
+               'sec-fetch-dest': 'document',
+               'accept-encoding': 'gzip, deflate, br',
+               'accept-language': 'en-US,en;q=0.9'}
+    session = requests.Session()
+    session.headers=headers
+
+    def search(self, query: str, generic_cover=""):
+        #timer=time()
+        def inner(link,index)->[dict,int]:
+             with self.session as session:
+                r = session.get(f"https://www.amazon.com/{link}")
+                r.raise_for_status()
+                long_soup = BS(r.text, "lxml")  #~4sec :/
+                soup2 = long_soup.find("div", attrs={"cel_widget_id": "dpx-books-ppd_csm_instrumentation_wrapper"})
+                if soup2 is None:
+                    return
+                try:
+                    v = dict()
+                    v['source'] = {
+                        "id": self.__id__,
+                        "description": "Amazon Books",
+                        "link": "https://amazon.com/"
+                    }
+                    v['url'] = f"https://www.amazon.com/{link}"
+
+                    #the more searches the slower, these are too hard to find in reasonable time or might not even exist
+                    v['publisher'] = ""  # very unreliable
+                    v['publishedDate'] = ""  # very unreliable
+                    v['id'] = None  # ?
+                    v['tags'] = []  # dont exist on amazon
+
+
+                    try:
+                        v['description'] = "\n".join(
+                            soup2.find("div", attrs={"data-feature-name": "bookDescription"}).stripped_strings).replace(
+                            "\xa0"," ")[:-9].strip().strip("\n")
+                    except (AttributeError, TypeError):
+                        return None  # if there is no description it is not a book and therefore should be ignored
+                    try:
+                        v['title'] = soup2.find("span", attrs={"id": "productTitle"}).text
+                    except (AttributeError, TypeError):
+                        v['title'] = ""
+                    try:
+                        v['authors'] = [next(
+                            filter(lambda i: i != " " and i != "\n" and not i.startswith("{"),
+                                   x.findAll(text=True))).strip()
+                                        for x in soup2.findAll("span", attrs={"class": "author"})]
+                    except (AttributeError, TypeError, StopIteration):
+                        v['authors'] = ""
+                    try:
+                        v['rating'] = int(
+                            soup2.find("span", class_="a-icon-alt").text.split(" ")[0].split(".")[
+                                0])  # first number in string
+                    except (AttributeError, ValueError):
+                        v['rating'] = 0
+                    try:
+                        v['cover'] = soup2.find("img", attrs={"class": "a-dynamic-image frontImage"})["src"]
+                    except (AttributeError, TypeError):
+                        v['cover'] = ""
+                    return v,index
+                except:
+                    return
+
+        val = list()
+        if self.active:
+            results = self.session.get(
+                f"https://www.amazon.com/s?k={query.replace(' ', '+')}&i=digital-text&sprefix={query.replace(' ', '+')}%2Cdigital-text&ref=nb_sb_noss",
+                headers=self.headers)
+            results.raise_for_status()
+            soup = BS(results.text, 'html.parser')
+            links_list = [next(filter(lambda i: "digital-text" in i["href"], x.findAll("a")))["href"] for x in
+                          soup.findAll("div", attrs={"data-component-type": "s-search-result"})]
+            with concurrent.futures.ThreadPoolExecutor(max_workers=5) as executor:
+                fut = {executor.submit(inner, link, index) for index, link in enumerate(links_list[:5])}
+                val=list(map(lambda x : x.result() ,concurrent.futures.as_completed(fut)))
+        #print(val)
+        #print(f"time was {time()-timer}")
+        result=list(filter(lambda x: x, val))
+        return [x[0] for x in sorted(result,key=itemgetter(1))] #sort by amazons listing order for best relevance
+