io.specmatic.core.HttpResponsePattern.kt Maven / Gradle / Ivy
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Turn your contracts into executable specifications. Contract Driven Development - Collaboratively Design & Independently Deploy MicroServices & MicroFrontends.
package io.specmatic.core
import io.specmatic.core.pattern.*
import io.specmatic.core.value.StringValue
import io.specmatic.stub.softCastValueToXML
const val DEFAULT_RESPONSE_CODE = 1000
data class HttpResponsePattern(
val headersPattern: HttpHeadersPattern = HttpHeadersPattern(),
val status: Int = 0,
val body: Pattern = EmptyStringPattern,
val responseValueAssertion: ResponseValueAssertion = AnyResponse
) {
constructor(response: HttpResponse) : this(HttpHeadersPattern(response.headers.mapValues { stringToPattern(it.value, it.key) }), response.status, response.body.exactMatchElseType())
fun generateResponse(resolver: Resolver): HttpResponse {
return attempt(breadCrumb = "RESPONSE") {
val value = softCastValueToXML(resolver.withCyclePrevention(body, body::generate))
val headers = headersPattern.generate(resolver).plus(SPECMATIC_RESULT_HEADER to "success").let { headers ->
when {
!headers.containsKey("Content-Type") -> headers.plus("Content-Type" to value.httpContentType)
else -> headers
}
}
HttpResponse(status, headers, value)
}
}
fun generateResponseWithAll(resolver: Resolver): HttpResponse {
return attempt(breadCrumb = "RESPONSE") {
val value = softCastValueToXML(body.generateWithAll(resolver))
val headers = headersPattern.generateWithAll(resolver).plus(SPECMATIC_RESULT_HEADER to "success").let { headers ->
when {
!headers.containsKey("Content-Type") -> headers.plus("Content-Type" to value.httpContentType)
else -> headers
}
}
HttpResponse(status, headers, value)
}
}
fun matches(response: HttpResponse, resolver: Resolver): Result {
val result = matchesResponse(response, resolver)
return when(result) {
is Result.Failure -> result.breadCrumb("RESPONSE")
else -> result
}
}
fun matchesResponse(response: HttpResponse, resolver: Resolver): Result {
return response to resolver to
::matchStatus then
::matchHeaders then
::matchResponseBodySchema then
::matchExactResponseBodyValue then
::summarize otherwise
::handleError toResult
::returnResult
}
fun withResponseExampleValue(row: Row, resolver: Resolver): HttpResponsePattern =
attempt(breadCrumb = "RESPONSE") {
val responseExample: ResponseExample = row.responseExampleForValidation ?: return@attempt this
val responseExampleMatchResult = matches(responseExample.responseExample, resolver)
if(responseExampleMatchResult is Result.Failure)
throw ContractException("""Error in response in example "${row.name}": ${responseExampleMatchResult.reportString()}""")
val expectedResponseValue: HttpResponsePattern =
HttpResponsePattern(
responseExample.headersPattern(),
responseExample.responseExample.status,
responseExample.bodyPattern()
)
val responseValueAssertion: ResponseValueAssertion = ValueAssertion(expectedResponseValue)
this.copy(responseValueAssertion = responseValueAssertion)
}
fun matchesMock(response: HttpResponse, resolver: Resolver) = matches(response, resolver)
private fun matchStatus(parameters: Pair): MatchingResult> {
if(status == DEFAULT_RESPONSE_CODE)
return MatchSuccess(parameters)
val (response, _) = parameters
val body = response.body
return when (response.status) {
status -> MatchSuccess(parameters)
else -> MatchFailure(mismatchResult("status $status", "status ${response.status}").copy(breadCrumb = "STATUS", failureReason = FailureReason.StatusMismatch))
}
}
private fun matchHeaders(parameters: Pair): MatchingResult>> {
val (response, resolver) = parameters
return when (val result = headersPattern.matches(response.headers, resolver)) {
is Result.Failure -> MatchSuccess(Triple(response, resolver, listOf(result)))
else -> MatchSuccess(Triple(response, resolver, emptyList()))
}
}
private fun matchResponseBodySchema(parameters: Triple>): MatchingResult>> {
val (response, resolver, failures) = parameters
val parsedValue = when (response.body) {
is StringValue -> try { body.parse(response.body.string, resolver) } catch(e: Throwable) { response.body }
else -> response.body
}
val result = body.matches(parsedValue, resolver)
if(result is Result.Failure)
return MatchSuccess(Triple(response, resolver, failures.plus(result.breadCrumb("BODY"))))
return MatchSuccess(parameters)
}
private fun matchExactResponseBodyValue(parameters: Triple>): MatchingResult>> {
val (response, resolver, failures) = parameters
val result = responseValueAssertion.matches(response, resolver.copy(mismatchMessages = valueMismatchMessages))
if(result is Result.Failure)
return MatchSuccess(Triple(response, resolver, failures.plus(result)))
return MatchSuccess(parameters)
}
fun bodyPattern(newBody: Pattern): HttpResponsePattern = this.copy(body = newBody)
fun encompasses(other: HttpResponsePattern, olderResolver: Resolver, newerResolver: Resolver): Result {
if(status != other.status)
return Result.Failure("The status didn't match", breadCrumb = "STATUS", failureReason = FailureReason.StatusMismatch)
val headerResult = headersPattern.encompasses(other.headersPattern, Resolver(), Resolver())
val bodyResult = resolvedHop(body, olderResolver).encompasses(resolvedHop(other.body, newerResolver), olderResolver, newerResolver).breadCrumb("BODY")
return Result.fromResults(listOf(headerResult, bodyResult)).breadCrumb("RESPONSE")
}
fun fromResponseExpectation(response: HttpResponse): HttpResponsePattern {
val responseHeaders = response.headers.mapValues { stringToPattern(it.value, it.key) }
val contentTypeHeader = if("content-type" !in responseHeaders.keys.map { it.lowercase() } && headersPattern.contentType != null)
mapOf("Content-Type" to ExactValuePattern(StringValue(headersPattern.contentType)))
else
emptyMap()
return HttpResponsePattern(
HttpHeadersPattern(responseHeaders + contentTypeHeader),
response.status,
response.body.exactMatchElseType()
)
}
fun resolveSubstitutions(substitution: Substitution, response: HttpResponse): HttpResponse {
val substitutedHeaders = substitution.resolveHeaderSubstitutions(response.headers, headersPattern.pattern).breadCrumb("RESPONSE.HEADERS").value
val substitutedBody = body.resolveSubstitutions(substitution, response.body, substitution.resolver).breadCrumb("RESPONSE.BODY").value
return response.copy(
headers = substitutedHeaders,
body = substitutedBody
)
}
}
private val valueMismatchMessages = object : MismatchMessages {
override fun mismatchMessage(expected: String, actual: String): String {
return "Value mismatch: Expected $expected, got value $actual"
}
override fun unexpectedKey(keyLabel: String, keyName: String): String {
return "Value mismatch: $keyLabel $keyName in value was unexpected"
}
override fun expectedKeyWasMissing(keyLabel: String, keyName: String): String {
return "Value mismatch: $keyLabel $keyName was missing"
}
}