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HTTP client library, with support for middleware and multiple adapters.
Security advisory:
This version has known vulnerabilities.
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lib/tesla/middleware/base_url.ex
defmodule Tesla.Middleware.BaseUrl do
@moduledoc """
Set base URL for all requests.
The base URL will be prepended to request path/URL only
if it does not include http(s).
## Examples
```
defmodule MyClient do
use Tesla
plug Tesla.Middleware.BaseUrl, "https://example.com/foo"
end
MyClient.get("/path") # equals to GET https://example.com/foo/path
MyClient.get("path") # equals to GET https://example.com/foo/path
MyClient.get("") # equals to GET https://example.com/foo
MyClient.get("http://example.com/bar") # equals to GET http://example.com/bar
```
"""
@behaviour Tesla.Middleware
@impl Tesla.Middleware
def call(env, next, base) do
env
|> apply_base(base)
|> Tesla.run(next)
end
defp apply_base(env, base) do
if Regex.match?(~r/^https?:\/\//i, env.url) do
# skip if url is already with scheme
env
else
%{env | url: join(base, env.url)}
end
end
defp join(base, url) do
case {String.last(to_string(base)), url} do
{nil, url} -> url
{"/", "/" <> rest} -> base <> rest
{"/", rest} -> base <> rest
{_, ""} -> base
{_, "/" <> rest} -> base <> "/" <> rest
{_, rest} -> base <> "/" <> rest
end
end
end