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# fetchcode is a free software tool from nexB Inc. and others.
# Visit https://github.com/aboutcode-org/fetchcode for support and download.
#
# Copyright (c) nexB Inc. and others. All rights reserved.
# http://nexb.com and http://aboutcode.org
#
# This software is licensed under the Apache License version 2.0.
#
# You may not use this software except in compliance with the License.
# You may obtain a copy of the License at:
# http://apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software distributed
# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
# CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.
import
hashlib
import
os
import
sys
from
functools
import
partial
import
requests
from
dateutil
import
parser
as
dateparser
from
dateutil
.
parser
import
ParserError
def
fetch_github_tags_gql
(
purl
):
"""
Yield PackageVersion for given github ``purl`` using the GitHub GQL API.
"""
for
node
in
fetch_github_tag_nodes
(
purl
):
name
=
node
[
"name"
]
target
=
node
[
"target"
]
# in case the tag is a signed tag, then the commit info is in target['target']
if
"committedDate"
not
in
target
:
target
=
target
[
"target"
]
committed_date
=
target
.
get
(
"committedDate"
)
release_date
=
None
if
committed_date
:
try
:
release_date
=
dateparser
.
parse
(
committed_date
)
except
ParserError
as
e
:
pass
yield
name
,
release_date
GQL_QUERY
=
"""
query getTags($name: String!, $owner: String!, $after: String)
{
repository(name: $name, owner: $owner) {
refs(refPrefix: "refs/tags/", first: 100, after: $after) {
totalCount
pageInfo {
endCursor
hasNextPage
}
nodes {
name
target {
... on Commit {
committedDate
}
... on Tag {
target {
... on Commit {
committedDate
}
}
}
}
}
}
}
}"""
def
fetch_github_tag_nodes
(
purl
):
"""
Yield node name/target mappings for Git tags of the ``purl``.
Each node has this shape:
{
"name": "v2.6.24-rc5",
"target": {
"target": {
"committedDate": "2007-12-11T03:48:43Z"
}
}
},
"""
variables
=
{
"owner"
:
purl
.
namespace
,
"name"
:
purl
.
name
,
}
graphql_query
=
{
"query"
:
GQL_QUERY
,
"variables"
:
variables
,
}
while
True
:
response
=
github_response
(
graphql_query
)
refs
=
response
[
"data"
][
"repository"
][
"refs"
]
for
node
in
refs
[
"nodes"
]:
yield
node
page_info
=
refs
[
"pageInfo"
]
if
not
page_info
[
"hasNextPage"
]:
break
# to fetch next page, we just set the after variable to endCursor
variables
[
"after"
]
=
page_info
[
"endCursor"
]
class
GitHubTokenError
(
Exception
):
pass
class
GraphQLError
(
Exception
):
pass
def
get_github_token
():
gh_token
=
os
.
environ
.
get
(
"GH_TOKEN"
,
None
)
if
not
gh_token
:
from
dotenv
import
load_dotenv
load_dotenv
()
gh_token
=
os
.
environ
.
get
(
"GH_TOKEN"
,
None
)
return
gh_token
def
github_response
(
graphql_query
):
gh_token
=
get_github_token
()
if
not
gh_token
:
msg
=
(
"GitHub API Token Not Set
\n
"
"Set your GitHub token in the GH_TOKEN environment variable."
)
raise
GitHubTokenError
(
msg
)
headers
=
{
"Authorization"
:
f"bearer
{
gh_token
}
"
}
endpoint
=
"https://api.github.com/graphql"
response
=
requests
.
post
(
endpoint
,
headers
=
headers
,
json
=
graphql_query
).
json
()
message
=
response
.
get
(
"message"
)
if
message
and
message
==
"Bad credentials"
:
raise
GitHubTokenError
(
f"Invalid GitHub token:
{
message
}
"
)
errors
=
response
.
get
(
"errors"
)
if
errors
:
raise
GraphQLError
(
errors
)
return
response
def
get_github_rest
(
url
):
headers
=
None
gh_token
=
get_github_token
()
if
gh_token
:
headers
=
{
"Authorization"
:
f"Bearer
{
gh_token
}
"
,
}
return
get_response
(
url
,
headers
)
def
get_response
(
url
,
headers
=
None
):
resp
=
requests
.
get
(
url
,
headers
=
headers
)
if
resp
.
status_code
==
200
:
return
resp
.
json
()
raise
Exception
(
f"Failed to fetch:
{
url
}
"
)
def
get_text_response
(
url
,
headers
=
None
):
resp
=
requests
.
get
(
url
,
headers
=
headers
)
if
resp
.
status_code
==
200
:
return
resp
.
text
raise
Exception
(
f"Failed to fetch:
{
url
}
"
)
def
make_head_request
(
url
,
headers
=
None
):
try
:
resp
=
requests
.
head
(
url
,
headers
=
headers
)
return
resp
except
requests
.
RequestException
:
raise
Exception
(
f"Failed to fetch:
{
url
}
"
)
def
get_hashed_path
(
name
):
"""
Returns a string with a part of the file path derived from the md5 hash.
From https://github.com/CocoaPods/cdn.cocoapods.org:
"There are a set of known prefixes for all Podspec paths, you take the
name of the pod, create a hash (using md5) of it and take the first
three characters."
"""
if
not
name
:
return
podname
=
get_podname_proper
(
name
)
if
name
!=
podname
:
name_to_hash
=
podname
else
:
name_to_hash
=
name
hash_init
=
get_first_three_md5_hash_characters
(
name_to_hash
)
hashed_path
=
"/"
.
join
(
list
(
hash_init
))
return
hashed_path
# for FIPS support
sys_v0
=
sys
.
version_info
[
0
]
sys_v1
=
sys
.
version_info
[
1
]
if
sys_v0
==
3
and
sys_v1
>=
9
:
md5_hasher
=
partial
(
hashlib
.
md5
,
usedforsecurity
=
False
)
else
:
md5_hasher
=
hashlib
.
md5
def
get_podname_proper
(
podname
):
"""
Podnames in cocoapods sometimes are files inside a pods package (like 'OHHTTPStubs/Default')
This returns proper podname in those cases.
"""
if
"/"
in
podname
:
return
podname
.
split
(
"/"
)[
0
]
return
podname
def
get_first_three_md5_hash_characters
(
podname
):
"""
From https://github.com/CocoaPods/cdn.cocoapods.org:
"There are a set of known prefixes for all Podspec paths, you take the name of the pod,
create a hash (using md5) of it and take the first three characters."
"""
return
md5_hasher
(
podname
.
encode
(
"utf-8"
)).
hexdigest
()[
0
:
3
]
def
_http_exists
(
url
:
str
)
->
bool
:
"""
Lightweight existence check using a ranged GET so CDNs/servers that ignore HEAD still work.
"""
try
:
resp
=
make_head_request
(
url
,
headers
=
{
"Range"
:
"bytes=0-0"
})
return
resp
is
not
None
and
resp
.
status_code
in
(
200
,
206
)
except
Exception
:
return
False
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