Add issuer validation when making call to OIDC endpoint #5358
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bgavrilMS
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tests/Microsoft.Identity.Test.Integration.netcore/HeadlessTests/CiamIntegrationTests.cs
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src/client/Microsoft.Identity.Client/Instance/Oidc/OidcRetrieverWithCache.cs
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tests/Microsoft.Identity.Test.Integration.netcore/HeadlessTests/CiamIntegrationTests.cs
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src/client/Microsoft.Identity.Client/Instance/Oidc/OidcRetrieverWithCache.cs
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…/microsoft-authentication-library-for-dotnet into avdunn/issuer-validation
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This PR adds issuer validation for OIDC scenarios: 3268765
As per OAuth spec, an issuer is valid if it matches the authority. In addition to the standard spec, there is also special validation for CIAM-style issuers which will mainly be relevant when using custom authorities in a CIAM scenario.