Add highcharts loader (#46)

* Add highchart loader

* update contributors and create requirements.txt

* update README

* Merge branch 'feature/highchart-loader' of github.com:lionasp/Python-Scripts into feature/highchart-loader

# Conflicts:
#	README.md

Author: lionasp

README.md

@@ -128,6 +128,36 @@ cd dictionary
 python app.py
 ```
 
+* ### Highcharts loader
+It is a simple program that can load charts from [highcharts](www.highcharts.com).
+After loading chart you can save it to file or embed it into your html page in base64 format.
+Don't forget install `requests` library from `highcharts_loader_requirements.txt`
+```python
+from highcharts_loader import ChartLoader, Options
+
+options = Options(from_file='options.json')
+chart = ChartLoader(options)
+chart.save_to_file('result.png')
+```
+
+options.json example:
+```json
+{
+    "chart": {
+        "type": "bar"
+    },
+    "title": {
+        "text": "Which channels are driving engagement?"
+    },
+    "xAxis": {
+        "categories": ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
+                       "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
+    },
+    "series": [{
+        "data": [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
+    }]
+}
+```
 
 * ### Image Encoder
 It is a simple program to encode and decode images, which helps to reduce and handle images on server, as it is convertedto base64 address.
@@ -365,6 +395,7 @@ The following people helped in creating the above content.
 * <a href="https://github.com/pr0me" target="_blank">Lukas S.</a>
 * <a href="https://github.com/iyanuashiri" target="_blank">Iyanu Ashiri</a>
 * <a href="https://github.com/niharikakrishnan">Niharika Krishnan</a>
+* <a href="https://github.com/lionasp" target="_blank">Pugach Vitalii</a>
 
 ### If you like the project give a star  [<img src="Selection_008.png" alt="Star button" align="top">](https://github.com/Logan1x/Python-Scripts/stargazers)
 

bin/highcharts_loader.py

@@ -0,0 +1,56 @@
+import json
+from base64 import b64encode
+
+import requests
+
+
+class EmptyParams(Exception):
+    pass
+
+
+class ToManyParams(Exception):
+    pass
+
+
+class Options:
+    data = {}
+
+    def __init__(self, *, from_file=None, from_dict=None):
+        if not from_file and not from_dict:
+            raise EmptyParams('You should pass "from_file" or "from_dict" param.')
+        if from_file and from_dict:
+            raise ToManyParams('You should pass only one param: "from_file" or "from_dict".')
+
+        self.data = json.loads(open(from_file).read()) if from_file else from_dict
+
+
+class ChartLoader:
+    raw_chart_data = None
+    url = 'http://export.highcharts.com/'
+    image_type = None
+
+    def __init__(self, options: Options, image_type='image/png'):
+        self.image_type = image_type
+        response = requests.post(self.url, data={
+            'type': image_type,
+            'options': json.dumps(options.data)
+        })
+        if response.status_code == requests.codes.ok:
+            self.raw_chart_data = response.content
+        else:
+            response.raise_for_status()
+
+    def _decoded_chart(self):
+        return b64encode(self.raw_chart_data).decode()
+
+    def get_data_image(self):
+        return 'data:image/{0};charset=utf-8;base64,{1}'.format(self.image_type,
+                                                                self._decoded_chart())
+
+    def get_raw_data(self):
+        return self.raw_chart_data
+
+    def save_to_file(self, path):
+        f = open(path, 'wb+')
+        f.write(self.raw_chart_data)
+        f.close()

bin/highcharts_loader_requirements.txt

@@ -0,0 +1 @@
+requests==2.8.14