Mercurial > odfcast > odfcast

annotate odfcast/convert.py @ 47:e99cbb47eafb

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Improve error handling by returning flask/werkzeug responses directly on errors
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 28 Oct 2014 10:51:42 +0100
parents 6d511e93a331
children 64f3e3a28bd4
rev   line source
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1 # -*- coding: utf-8 -*-
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2
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3 import logging
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4 import tempfile
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5
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6 from flask import request, Response, json, render_template
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7 from flask.views import MethodView
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8
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9 from py3o.template import Template
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10
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11 from PyPDF2 import PdfFileMerger
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12
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13 from werkzeug.utils import escape
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14
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15 log = logging.getLogger(__name__)
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16
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17 ALLOWED_FORMATS = ["pdf", "doc", "docx", "odt"]
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18
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19 PDF_MIMETYPE = "application/pdf"
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20 JSON_MIMETYPE = "application/json"
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21 HTML_MIMETYPE = "text/html"
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22
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23 MIMETYPES = {
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24 "odt": "application/vnd.oasis.opendocument.text",
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25 "doc": "application/msword",
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26 "docx": "application/vnd.openxmlformats-officedocument"
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27 ".wordprocessingml.document",
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28 "pdf": PDF_MIMETYPE,
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29 }
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30
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31 DEFAULT_MIMETYPE = "application/octet-stream"
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33
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34 class ErrorResponse(Response):
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35
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36 BAD_REQUEST_ERROR_CODE = 400
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37
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38 def __init__(self, title, error_code, details,
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39 html_error_code=BAD_REQUEST_ERROR_CODE):
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40 data, mime_type = self.get_response_data(title, error_code, details)
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41 super(ErrorResponse, self).__init__(response=data, mimetype=mime_type,
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42 status=html_error_code)
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43
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44 def json(self, title, error_code, details):
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45 return json.dumps({
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46 "error": title,
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47 "error_code": error_code,
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48 "details": details,
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49 }), JSON_MIMETYPE
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50
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51 def html(self, title, error_code, details):
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52 data = ""
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53 return (
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54 u'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
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55 u'<title>%(code)s %(name)s</title>\n'
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56 u'<h1>%(name)s</h1>\n'
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57 u'%(details)s\n'
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58 ) % {
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59 "code": error_code,
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60 "name": escape(title),
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61 "details": escape(details),
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62 }
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63 return data, HTML_MIMETYPE
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64
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65 def get_response_data(self, title, error_code, details):
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66 if self.is_wants_json():
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67 return self.json(title, error_code, details)
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68 return self.html(title, error_code, details)
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69
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70 def is_wants_json(self):
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71 best = request.accept_mimetypes.best_match([JSON_MIMETYPE,
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72 HTML_MIMETYPE])
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73 return best == JSON_MIMETYPE and \
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74 request.accept_mimetypes[best] > \
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75 request.accept_mimetypes[HTML_MIMETYPE]
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76
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78 class TemplateErrorResponse(ErrorResponse):
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79
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80 TEMPLATE_ERROR_CODE = 100
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81
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82 def __init__(self, details, error_code=TEMPLATE_ERROR_CODE):
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83 super(TemplateErrorResponse, self).__init__(
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84 title="TemplateError", error_code=error_code, details=details,
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85 html_error_code=500)
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86
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87
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88 class ConversionErrorResponse(ErrorResponse):
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89
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90 CONVERSION_ERROR_CODE = 200
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91
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92 def __init__(self, details, error_code=CONVERSION_ERROR_CODE):
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93 super(TemplateErrorResponse, self).__init__(
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94 title="ConversionError", error_code=error_code, details=details,
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95 html_error_code=500)
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97
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98 class ConvertView(MethodView):
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99
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100 def __init__(self, pyuno_driver_name="", hostname="localhost", port=2001):
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101 driver_module = self._load_driver_module(pyuno_driver_name)
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102 self.convertor = driver_module.Convertor(hostname, port)
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103
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104 def _load_driver_module(self, pyuno_driver_name):
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105 return __import__(pyuno_driver_name, globals(), locals(),
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106 ["Convertor"])
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107
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108 def is_format_supported(self, fformat):
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109 return fformat and fformat.lower() in ALLOWED_FORMATS
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110
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111 def post(self):
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112 ffile = request.files['file']
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113 if not ffile.filename:
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114 return ErrorResponse(
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115 "Upload file missing", error_code=101,
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116 details="Please upload a file for conversion",
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117 html_error_code=400)
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118
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119 fformat = request.form['format']
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120 if not self.is_format_supported(fformat):
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121 return ErrorResponse(
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122 "Invalid format", error_code=102,
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123 details="Format %s not allowed" % fformat,
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124 html_error_code=400)
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125
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126 datadict = self.get_datadict()
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127
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128 mimetype = self.get_mimetype_for_format(fformat)
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129
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130 outfile = self.save_form_file(ffile)
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131
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132 if datadict:
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133 try:
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134 tfile = tempfile.NamedTemporaryFile()
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135 t = Template(outfile, tfile, ignore_undefined_variables=True)
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136 t.render(datadict)
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137 outfile.close()
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138 outfile = tfile
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139 except Exception, e:
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140 log.exception("Template error")
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141 return TemplateErrorResponse(details=str(e))
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142
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143 if fformat != "odt":
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144 try:
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145 outfile = self.convert(outfile, fformat)
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146 except Exception, e:
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147 log.exception("Conversion error")
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148 return ConversionErrorResponse(details=str(e))
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149
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150 return Response(outfile, mimetype=mimetype)
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151
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152 def get(self):
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153 return render_template("convert.html")
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154
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155 def save_form_file(self, infile):
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156 outfile = tempfile.NamedTemporaryFile()
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157 infile.save(outfile)
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158 infile.close()
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159 outfile.seek(0)
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160 return outfile
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161
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162 def convert(self, infile, fformat):
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163 outfile = tempfile.NamedTemporaryFile()
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164
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165 self.convertor.convert(infile.name, outfile.name, fformat)
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166
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167 infile.close()
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168 return outfile
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169
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170 def get_mimetype_for_format(self, fformat):
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171 return MIMETYPES.get(fformat, DEFAULT_MIMETYPE)
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172
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173 def get_datadict(self):
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174 vars = request.form.get('datadict')
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175 if not vars:
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176 return None
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177 return json.loads(vars)
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178
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179
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180 class MergeView(MethodView):
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181
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182 def get(self):
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183 return render_template("merge.html")
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184
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185 def post(self):
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186 merger = PdfFileMerger()
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187 ffiles = request.files.getlist('files')
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188
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189 for ffile in ffiles:
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190 merger.append(ffile)
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191
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192 outfile = tempfile.NamedTemporaryFile()
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193
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194 merger.write(outfile.name)
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195
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196 merger.close()
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197 return Response(outfile, mimetype=PDF_MIMETYPE)
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198
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199
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200 class TemplateView(MethodView):
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201
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202 template_name = ""
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203
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204 def __init__(self, template_name=None):
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205 if template_name:
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206 self.template_name = template_name
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207
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208 def get_template_name(self):
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209 return self.template_name
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210
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211 def get(self):
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212 return render_template(self.get_template_name())
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