Mercurial > odfcast > odfcast

annotate odfcast/convert.py @ 60:ae377f7eed18

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Add ErrorResponse class for resposes after an error has occured during the merge
author Björn Ricks <bjoern.ricks@intevation.de>
date Wed, 12 Nov 2014 12:40:31 +0100
parents 2dacbe7fb7f9
children d8fc52aceb9c
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 u'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">\n'
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54 u'<title>%(code)s %(name)s</title>\n'
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55 u'<h1>%(name)s</h1>\n'
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56 u'%(details)s\n'
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57 ) % {
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58 "code": error_code,
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59 "name": escape(title),
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60 "details": escape(details),
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61 }
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62 return data, HTML_MIMETYPE
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63
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64 def get_response_data(self, title, error_code, details):
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65 if self.is_wants_json():
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66 return self.json(title, error_code, details)
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67 return self.html(title, error_code, details)
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68
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69 def is_wants_json(self):
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70 best = request.accept_mimetypes.best_match([JSON_MIMETYPE,
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71 HTML_MIMETYPE])
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72 return best == JSON_MIMETYPE and \
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73 request.accept_mimetypes[best] > \
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74 request.accept_mimetypes[HTML_MIMETYPE]
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77 class TemplateErrorResponse(ErrorResponse):
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78
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79 TEMPLATE_ERROR_CODE = 100
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80
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81 def __init__(self, details, error_code=TEMPLATE_ERROR_CODE):
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82 super(TemplateErrorResponse, self).__init__(
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83 title="TemplateError", error_code=error_code, details=details,
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84 html_error_code=500)
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86
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87 class ConversionErrorResponse(ErrorResponse):
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88
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89 CONVERSION_ERROR_CODE = 200
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90
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91 def __init__(self, details, error_code=CONVERSION_ERROR_CODE):
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92 super(ConversionErrorResponse, self).__init__(
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93 title="ConversionError", error_code=error_code, details=details,
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94 html_error_code=500)
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97 class MergeErrorResponse(ErrorResponse):
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98
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99 MERGE_ERROR_CODE = 300
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100
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101 def __init__(self, details, error_code=MERGE_ERROR_CODE):
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102 super(MergeErrorResponse, self).__init__(
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103 title="MergeError", error_code=error_code, details=details,
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104 html_error_code=500)
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105
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106
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107 class ConvertView(MethodView):
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108
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109 def __init__(self, pyuno_driver_name="", hostname="localhost", port=2001):
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110 driver_module = self._load_driver_module(pyuno_driver_name)
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111 self.convertor = driver_module.Convertor(hostname, port)
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112
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113 def _load_driver_module(self, pyuno_driver_name):
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114 return __import__(pyuno_driver_name, globals(), locals(),
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115 ["Convertor"])
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116
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117 def is_format_supported(self, fformat):
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118 return fformat and fformat.lower() in ALLOWED_FORMATS
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119
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120 def post(self):
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121 ffile = request.files['file']
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122 if not ffile.filename:
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123 return ErrorResponse(
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124 "Upload file missing", error_code=101,
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125 details="Please upload a file for conversion",
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126 html_error_code=400)
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127
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128 fformat = request.form['format']
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129 if not self.is_format_supported(fformat):
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130 return ErrorResponse(
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131 "Invalid format", error_code=102,
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132 details="Format %s not allowed" % fformat,
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133 html_error_code=400)
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134
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135 datadict = self.get_datadict()
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136
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137 mimetype = self.get_mimetype_for_format(fformat)
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138
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139 outfile = self.save_form_file(ffile)
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140
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141 if datadict:
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142 try:
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143 tfile = tempfile.NamedTemporaryFile()
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144 t = Template(outfile, tfile, ignore_undefined_variables=True)
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145 t.render(datadict)
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146 outfile.close()
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147 outfile = tfile
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148 except Exception, e:
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149 log.exception("Template error")
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150 return TemplateErrorResponse(details=str(e))
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151
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152 if fformat != "odt":
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153 try:
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154 outfile = self.convert(outfile, fformat)
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155 except Exception, e:
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156 log.exception("Conversion error")
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157 return ConversionErrorResponse(details=str(e))
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158
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159 return Response(outfile, mimetype=mimetype)
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160
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161 def get(self):
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162 return render_template("convert.html")
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163
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164 def save_form_file(self, infile):
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165 outfile = tempfile.NamedTemporaryFile()
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166 infile.save(outfile)
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167 infile.close()
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168 outfile.seek(0)
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169 return outfile
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170
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171 def convert(self, infile, fformat):
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172 outfile = tempfile.NamedTemporaryFile()
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173
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174 self.convertor.convert(infile.name, outfile.name, fformat)
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175
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176 infile.close()
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177 return outfile
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178
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179 def get_mimetype_for_format(self, fformat):
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180 return MIMETYPES.get(fformat, DEFAULT_MIMETYPE)
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181
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182 def get_datadict(self):
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183 vars = request.form.get('datadict')
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184 if not vars:
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185 return None
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186 return json.loads(vars)
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187
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188
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189 class MergeView(MethodView):
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190
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191 def get(self):
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192 return render_template("merge.html")
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193
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194 def post(self):
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195 log.debug("Merging PDF documents")
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196
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197 merger = PdfFileMerger()
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198 ffiles = request.files.getlist('files')
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199
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200 for ffile in ffiles:
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201 merger.append(ffile)
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202
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203 outfile = tempfile.NamedTemporaryFile()
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204
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205 merger.write(outfile)
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206 merger.close()
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207 outfile.seek(0)
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208
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209 log.debug("PDF documents merged")
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210 return Response(outfile, mimetype=PDF_MIMETYPE)
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211
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212
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213 class TemplateView(MethodView):
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214
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215 template_name = ""
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216
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217 def __init__(self, template_name=None):
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218 if template_name:
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219 self.template_name = template_name
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220
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221 def get_template_name(self):
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222 return self.template_name
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223
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224 def get(self):
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225 return render_template(self.get_template_name())
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