20

Author: JavaProgrammerLB

20.py

@@ -0,0 +1,109 @@
+import requests
+import zipfile
+
+
+def main():
+    url = "http://www.pythonchallenge.com/pc/hex/unreal.jpg"
+    auth = ("butter", "fly")
+    # first_step(url, auth)
+    # second_step(url, auth)
+    # third_step(url, auth)
+    # fourth_step(hint)
+    # five_step(url, auth)
+    # six_step(url, auth)
+    seven_step("fence/1152983631.zip")
+
+
+def first_step(url, auth):
+    res = requests.get(url, auth=auth)
+    res_header = res.headers
+    res_content = res.content
+    print("res_header is {}, res_content is {}".format(res_header, res_content))
+    # 'Content-Range': 'bytes 0-30202/2123456789
+
+
+def second_step(url, auth):
+    start = 0
+    while True:
+        print("start is {}".format(start))
+        if start >= 2123456789:
+            break
+        headers = {"RANGE": "bytes={}-".format(start)}
+        res = requests.get(url, auth=auth, headers=headers)
+        res_headers = res.headers
+        res_content_range = res_headers.get("Content-Range")
+        if res_content_range is not None:
+            begin, end = get_start_end(res_content_range)
+            print("===================== {} ========================".format(start))
+            print("res_content is {}".format(res.content))
+            print("res_heads is {}".format(res.headers))
+            print("res_raw is {}".format(res.raw))
+            print("res_text is {}".format(res.text))
+            print("res_cookies is {}".format(res.cookies))
+            print("=================================================")
+            start = int(end)
+        else:
+            start += 1
+
+
+def get_start_end(st):
+    bscount_sum = st[6:]
+    start_to_end = bscount_sum.split("/")[0]
+    start = start_to_end.split("-")[0]
+    end = start_to_end.split("-")[1]
+    print("start is {}, end is {}".format(start, end))
+    return start, end
+
+
+def third_step(url, auth):
+    request_url_with_range(url, auth, 2123456789)
+    # esrever ni emankcin wen ruoy si drowssap eht
+
+
+def request_url_with_range(url, auth, num):
+    headers = {"RANGE": "bytes={}-".format(num)}
+    res = requests.get(url, auth=auth, headers=headers)
+    print("=================================================")
+    print("res_content is {}".format(res.content))
+    print("res_heads is {}".format(res.headers))
+    print("res_raw is {}".format(res.raw))
+    print("res_text is {}".format(res.text))
+    print("res_cookies is {}".format(res.cookies))
+    print("=================================================")
+
+
+def fourth_step(hint):
+    result = ""
+    for i in range(len(hint) - 1, -1, -1):
+        result += hint[i]
+    print(result)
+    return result
+    # the password is your new nickname in reverse
+
+
+def five_step(url, auth):
+    request_url_with_range(url, auth, 2123456743)
+    # and it is hiding at 1152983631.
+
+
+def six_step(url, auth):
+    headers = {"RANGE": "bytes={}-".format(1152983631)}
+    res = requests.get(url, auth=auth, headers=headers)
+    print(res.content)
+    file = open("fence/1152983631.zip", "wb")
+    file.write(res.content)
+    print("finished")
+
+
+def seven_step(file_path):
+    with zipfile.ZipFile(file_path) as myzip:
+        pwd = fourth_step("invader")
+        print(pwd)
+        files = myzip.filelist
+        for file in files:
+            with myzip.open(file.filename, pwd=pwd.encode()) as tem_file:
+                print(tem_file.read())
+
+
+if __name__ == "__main__":
+    main()

README.md

@@ -1,6 +1,21 @@
 # pythonchallenge
 Solve Problems in http://www.pythonchallenge.com
 
+#### 20
+result: password is redavni
+```python
+import requests
+import zipfile
+```
+- requests is a good lib for http request
+- request an url with username and password
+- breakpoint resume
+- you shoule know a http header {"RANGE":"bytes 0-500"}
+- revers
+- ZIP file Magic number: none or "PK\x03\x04" or "PK\x05\x06"(empty) or "PK\x07\x08"(spanned), PK for Phil Katz
+- find points in 2123456789 points
+
+
 #### 19
 result: http://www.pythonchallenge.com/pc/hex/idiot2.html
 ```python

fence/1152983631.zip

@@ -0,0 +1,7 @@
+Yes! This is really level 21 in here. 
+And yes, After you solve it, you'll be in level 22!
+
+Now for the level:
+
+* We used to play this game when we were kids
+* When I had no idea what to do, I looked backwards.