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jwt claims based authorization
<policies>
<inbound>
<!-- validates RS256 JWT token -->
<validate-jwt header-name="massrover_token" failed-validation-httpcode="401" failed-validation-error-message="Unauthorized"
require-expiration-time="true" require-signed-tokens="true">
<audiences>
<audience>audience id</audience>
</audiences>
<issuers>
<issuer>issuer id</issuer>
</issuers>
<required-claims>
<claim name="role" match="any">
<value>admin</value>
<value>moderator</value>
<value>reader</value>
</claim>
</required-claims>
<openid-config url="https://massrover.idenityserver/.well-known/openid-configuration" />
</validate-jwt>
<!-- sets the role claim to the context variable -->
<set-variable name="massrover_role"
value="@(context.Request.Headers["massrover_token"].First().Split(' ')[1].AsJwt()?.Claims["role"].FirstOrDefault())" />
<!-- performs authorization based on role claim and allowed http method -->
<choose>
<when condition="@(context.Variables.GetValue("massrover_role").Equals("admin"))">
<forward-request/>
</when>
<when condition="@(context.Variables.GetValue("massrover_role").Equals("moderator")">
<when condition="@(context.Request.Method.Equals("delete", StringComparison.OrdinalIgnoreCase))">
<return-response>
<set-status code="403" reason="Forbidden" />
<set-body>Moderators cannot perform delete action</set-body>
</return-response>
</when>
<otherwise>
<forward-request/>
</otherwise>
</when>
<when condition="@(context.Variables.GetValue("massrover_role").Equals("reader")">
<when condition="@(context.Request.Method.Equals("get", StringComparison.OrdinalIgnoreCase))">
<forward-request/>
</when>
<otherwise>
<return-response>
<set-status code="403" reason="Forbidden" />
<set-body>Readers have only read access</set-body>
</return-response>
</otherwise>
</when>
<otherwise>
<return-response">
<set-status code="405" reason="Not Allowed" />
<set-body>Invalid role claim</set-body>
</return-response>
</otherwise>
</choose>
<base />
</inbound>
<backend>
<base />
</backend>
<outbound>
<base />
</outbound>
<on-error>
<base />
</on-error>
</policies>
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