Add easymap script

backend/Pipfile

@@ -1,16 +1,24 @@
 [[source]]
+
 name = "pypi"
 url = "https://pypi.org/simple"
 verify_ssl = true
 
+
 [dev-packages]
+
 black = "==19.3b0"
 
+
 [packages]
+
 django = "==2.2.3"
-psycopg2-binary = "==2.8.3"
+"psycopg2-binary" = "==2.8.3"
 djangorestframework = "==3.9.2"
 python-dotenv = "==0.10.3"
+requests = "*"
+
 
 [requires]
+
 python_version = "3.7"

backend/easymap.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+
+import requests
+import re
+
+def get_session():
+    easymap_url = "http://easymap.land.moi.gov.tw/P02/Index"
+    sess = requests.Session()
+    sess.headers.update({"User-Agent": "Mozilla/5.0"})
+    del sess.headers["Accept-Encoding"]
+    del sess.headers["Accept"]
+    del sess.headers["Connection"]
+    sess.get(easymap_url)
+    return sess
+
+def get_point_city(sess, x, y):
+    point_city_url = "http://easymap.land.moi.gov.tw/P02/Query_json_getPointCity"
+    # point_city_url = "http://localhost:1234"
+    data = { "wgs84x": x, "wgs84y": y }
+    r = sess.post(point_city_url, data=data)
+    return r.json()
+
+def get_token(sess):
+    set_token_url = "http://easymap.land.moi.gov.tw/P02/pages/setToken.jsp"
+    token_re = re.compile('<input type="hidden" name="(.*?)" value="(.*?)" />')
+    r = sess.post(set_token_url)
+    return dict([
+        (m.group(1), m.group(2))
+        for m in token_re.finditer(r.text)
+        ])
+
+def get_land_number(sess, x, y, city, token):
+    get_door_json_url = "http://easymap.land.moi.gov.tw/P02/Door_json_getDoorInfoByXY"
+    data = { "city": city["cityCode"], "coordX": x, "coordY": y, **token }
+    resp = sess.post(get_door_json_url,
+            data=data)
+    return resp
+
+def main(x, y):
+    sess = get_session()
+    city = get_point_city(sess, x=x, y=y)
+    token = get_token(sess)
+    r = get_land_number(sess, x=x, y=y, city=city, token=token)
+    print(r.text)
+
+if __name__ == "__main__":
+    import sys
+    if len(sys.argv) != 3:
+        print("Usage: easymap.py <wgs84x> <wgs84y>")
+        sys.exit(-1)
+    x = sys.argv[1]
+    y = sys.argv[2]
+    main(x=x, y=y)