added Readme + main program

README.md

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+# issuu-dl
+
+This is a simple program to quickly install magazines etc. on [issuu.com](https://issuu.com) using ```issuu-dl [url]```.
+
+## Dependencies
+
+This python script needs three non-standard python modules: termcolor, img2pdf and tqdm.

issuu-dl

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+#!/usr/bin/env python3
+#
+# issuu-dl v0.2
+#
+# download pdf from issuu.com
+#
+# tested (and working) on 04 Mar 2021
+#
+
+# arch-deps: python-tqdm, python-termcolor, img2pdf
+
+import requests
+import sys
+import json
+import img2pdf
+import os
+from termcolor import colored
+from tqdm import tqdm
+
+def usage():
+    print("USAGE: %s [full issuu url of target document]" % sys.argv[0])
+    exit()
+
+try:
+    url = sys.argv[1]
+except:
+    usage()
+
+doc = url.split('/')
+doc = doc[3] + '/' + doc[5]
+print(doc)
+print("[*] doc is '%s'" % colored(doc, 'yellow'))
+outfile = doc.replace('/', '_') + ".pdf"
+
+print("[*] opening page...")
+s = requests.Session()
+r = s.get(url)
+assert r.status_code == 200
+print(colored("[+] url confirmed", "green"))
+assert 'issuu-reader3-embed-files' in r.content.decode()
+print(colored("[+] reader3 support confirmed", "green"))
+
+print("[*] downloading reader3_4.json...")
+
+r = s.get("https://reader3.isu.pub/%s/reader3_4.json" % doc)
+j = json.loads(r.content.decode())
+
+pubId = j["document"]["publicationId"]
+revId = j["document"]["revisionId"]
+pages = j["document"]["pages"]
+
+print(colored("[+] fetched document data: ", "green") + colored("publicationId is %s, revisionId is %s" % (pubId, revId), "yellow"))
+print(colored("[+] found %d pages" % len(pages), "green"))
+
+print("[*] downloading pages...")
+
+filenames = []
+for page in tqdm(pages):
+    i = page["imageUri"].split('/')
+    f = i[1]+"-"+i[3]
+    r = s.get("https://"+page["imageUri"])
+    open(f, "wb").write(r.content)
+    filenames.append(f)
+
+print(colored("[+] downloaded %s jpg files" % len(pages), "green"))
+
+print("[*] converting to single pdf...")
+
+with open(outfile, "wb") as out:
+    out.write(img2pdf.convert(filenames))
+
+print(colored("[+] output pdf '%s' is ready" % colored(outfile, "yellow"), "green"))
+
+print("[*] cleaning up jpg files...")
+for f in filenames:
+    os.remove(f)
+
+print(colored("[+] done.", "green"))