Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/schema_salad/fetcher.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
parents
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Resource fetching."""
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2 import logging
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3 import os
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4 import re
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5 import sys
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6 import urllib
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7 from typing import List, Optional
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8
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9 import requests
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10
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11 from .exceptions import ValidationException
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12 from .utils import CacheType
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13
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14 _re_drive = re.compile(r"/([a-zA-Z]):")
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15 _logger = logging.getLogger("salad")
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16
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17
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18 class Fetcher:
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19 def __init__(
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20 self,
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21 cache: CacheType,
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22 session: Optional[requests.sessions.Session],
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23 ) -> None:
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24 pass
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25
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26 def fetch_text(self, url: str, content_types: Optional[List[str]] = None) -> str:
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27 raise NotImplementedError()
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28
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29 def check_exists(self, url: str) -> bool:
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30 raise NotImplementedError()
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31
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32 def urljoin(self, base_url: str, url: str) -> str:
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33 raise NotImplementedError()
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34
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35 schemes = ["file", "http", "https", "mailto"]
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36
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37 def supported_schemes(self) -> List[str]:
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38 return self.schemes
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39
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40
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41 class DefaultFetcher(Fetcher):
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42 def __init__(
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43 self,
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44 cache: CacheType,
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45 session: Optional[requests.sessions.Session],
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46 ) -> None:
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47 self.cache = cache
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48 self.session = session
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49
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50 def fetch_text(self, url: str, content_types: Optional[List[str]] = None) -> str:
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51 """Retrieve the given resource as a string."""
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52 result = self.cache.get(url, None)
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53 if isinstance(result, str):
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54 return result
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55
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56 split = urllib.parse.urlsplit(url)
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57 scheme, path = split.scheme, split.path
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58
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59 if scheme in ["http", "https"] and self.session is not None:
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60 try:
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61 headers = {}
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62 if content_types:
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63 headers["Accept"] = ", ".join(content_types) + ", */*;q=0.8"
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64 resp = self.session.get(url, headers=headers)
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65 resp.raise_for_status()
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66 except Exception as e:
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67 raise ValidationException(f"Error fetching {url}: {e}") from e
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68 if content_types and "content-type" in resp.headers:
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69 content_type = resp.headers["content-type"].split(";")[:1][0]
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70 if content_type not in content_types:
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71 _logger.warning(
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72 f"While fetching {url}, got content-type of "
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73 f"'{content_type}'. Expected one of {content_types}."
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74 )
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75 return resp.text
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76 if scheme == "file":
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77 try:
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78 # On Windows, url.path will be /drive:/path ; on Unix systems,
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79 # /path. As we want drive:/path instead of /drive:/path on Windows,
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80 # remove the leading /.
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81 if os.path.isabs(
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82 path[1:]
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83 ): # checking if pathis valid after removing front / or not
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84 path = path[1:]
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85 with open(
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86 urllib.request.url2pathname(str(path)), encoding="utf-8"
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87 ) as fp:
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88 return str(fp.read())
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89
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90 except OSError as err:
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91 if err.filename == path:
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92 raise ValidationException(str(err)) from err
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93 else:
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94 raise ValidationException(f"Error reading {url}: {err}") from err
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95 raise ValidationException(f"Unsupported scheme in url: {url}")
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96
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97 def check_exists(self, url: str) -> bool:
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98 if url in self.cache:
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99 return True
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100
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101 split = urllib.parse.urlsplit(url)
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102 scheme, path = split.scheme, split.path
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103
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104 if scheme in ["http", "https"] and self.session is not None:
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105 try:
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106 resp = self.session.head(url)
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107 resp.raise_for_status()
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108 except Exception:
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109 return False
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110 self.cache[url] = True
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111 return True
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112 if scheme == "file":
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113 return os.path.exists(urllib.request.url2pathname(str(path)))
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114 if scheme == "mailto":
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115 return True
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116 raise ValidationException(f"Unsupported scheme in url: {url}")
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117
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118 def urljoin(self, base_url: str, url: str) -> str:
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119 if url.startswith("_:"):
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120 return url
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121
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122 basesplit = urllib.parse.urlsplit(base_url)
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123 split = urllib.parse.urlsplit(url)
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124 if basesplit.scheme and basesplit.scheme != "file" and split.scheme == "file":
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125 raise ValidationException(
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126 "Not resolving potential remote exploit {} from base {}".format(
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127 url, base_url
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128 )
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129 )
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130
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131 if sys.platform == "win32":
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132 if base_url == url:
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133 return url
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134 basesplit = urllib.parse.urlsplit(base_url)
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135 # note that below might split
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136 # "C:" with "C" as URI scheme
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137 split = urllib.parse.urlsplit(url)
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138
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139 has_drive = split.scheme and len(split.scheme) == 1
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140
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141 if basesplit.scheme == "file":
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142 # Special handling of relative file references on Windows
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143 # as urllib seems to not be quite up to the job
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144
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145 # netloc MIGHT appear in equivalents of UNC Strings
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146 # \\server1.example.com\path as
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147 # file:///server1.example.com/path
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148 # https://tools.ietf.org/html/rfc8089#appendix-E.3.2
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149 # (TODO: test this)
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150 netloc = split.netloc or basesplit.netloc
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151
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152 # Check if url is a local path like "C:/Users/fred"
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153 # or actually an absolute URI like http://example.com/fred
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154 if has_drive:
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155 # Assume split.scheme is actually a drive, e.g. "C:"
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156 # so we'll recombine into a path
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157 path_with_drive = urllib.parse.urlunsplit(
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158 (split.scheme, "", split.path, "", "")
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159 )
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160 # Compose new file:/// URI with path_with_drive
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161 # .. carrying over any #fragment (?query just in case..)
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162 return urllib.parse.urlunsplit(
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163 ("file", netloc, path_with_drive, split.query, split.fragment)
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164 )
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165 if (
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166 not split.scheme
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167 and not netloc
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168 and split.path
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169 and split.path.startswith("/")
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170 ):
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171 # Relative - but does it have a drive?
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172 base_drive = _re_drive.match(basesplit.path)
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173 drive = _re_drive.match(split.path)
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174 if base_drive and not drive:
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175 # Keep drive letter from base_url
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176 # https://tools.ietf.org/html/rfc8089#appendix-E.2.1
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177 # e.g. urljoin("file:///D:/bar/a.txt", "/foo/b.txt")
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178 # == file:///D:/foo/b.txt
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179 path_with_drive = "/{}:{}".format(
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180 base_drive.group(1), split.path
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181 )
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182 return urllib.parse.urlunsplit(
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183 (
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184 "file",
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185 netloc,
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186 path_with_drive,
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187 split.query,
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188 split.fragment,
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189 )
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190 )
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191
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192 # else: fall-through to resolve as relative URI
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193 elif has_drive:
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194 # Base is http://something but url is C:/something - which urllib
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195 # would wrongly resolve as an absolute path that could later be used
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196 # to access local files
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197 raise ValidationException(
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198 "Not resolving potential remote exploit {} from base {}".format(
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199 url, base_url
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200 )
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201 )
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202
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203 return urllib.parse.urljoin(base_url, url)