configuration.go

/*
 * finAPI Access (with deprecation)
 *
 * <strong>RESTful API for Account Information Services (AIS) and Payment Initiation Services (PIS)</strong>  The following pages give you some general information on how to use our APIs.<br/> The actual API services documentation then follows further below. You can use the menu to jump between API sections. <br/> <br/> This page has a built-in HTTP(S) client, so you can test the services directly from within this page, by filling in the request parameters and/or body in the respective services, and then hitting the TRY button. Note that you need to be authorized to make a successful API call. To authorize, refer to the 'Authorization' section of the API, or just use the OAUTH button that can be found near the TRY button. <br/>  <h2 id=\"general-information\">General information</h2>  <h3 id=\"general-error-responses\"><strong>Error Responses</strong></h3> When an API call returns with an error, then in general it has the structure shown in the following example:  <pre> {   \"errors\": [     {       \"message\": \"Interface 'FINTS_SERVER' is not supported for this operation.\",       \"code\": \"BAD_REQUEST\",       \"type\": \"TECHNICAL\"     }   ],   \"date\": \"2020-11-19 16:54:06.854\",   \"requestId\": \"selfgen-312042e7-df55-47e4-bffd-956a68ef37b5\",   \"endpoint\": \"POST /api/v1/bankConnections/import\",   \"authContext\": \"1/21\",   \"bank\": \"DEMO0002 - finAPI Test Redirect Bank\" } </pre>  If an API call requires an additional authentication by the user, HTTP code 510 is returned and the error response contains the additional \"multiStepAuthentication\" object, see the following example:  <pre> {   \"errors\": [     {       \"message\": \"Es ist eine zusätzliche Authentifizierung erforderlich. Bitte geben Sie folgenden Code an: 123456\",       \"code\": \"ADDITIONAL_AUTHENTICATION_REQUIRED\",       \"type\": \"BUSINESS\",       \"multiStepAuthentication\": {         \"hash\": \"678b13f4be9ed7d981a840af8131223a\",         \"status\": \"CHALLENGE_RESPONSE_REQUIRED\",         \"challengeMessage\": \"Es ist eine zusätzliche Authentifizierung erforderlich. Bitte geben Sie folgenden Code an: 123456\",         \"answerFieldLabel\": \"TAN\",         \"redirectUrl\": null,         \"redirectContext\": null,         \"redirectContextField\": null,         \"twoStepProcedures\": null,         \"photoTanMimeType\": null,         \"photoTanData\": null,         \"opticalData\": null       }     }   ],   \"date\": \"2019-11-29 09:51:55.931\",   \"requestId\": \"selfgen-45059c99-1b14-4df7-9bd3-9d5f126df294\",   \"endpoint\": \"POST /api/v1/bankConnections/import\",   \"authContext\": \"1/18\",   \"bank\": \"DEMO0001 - finAPI Test Bank\" } </pre>  An exception to this error format are API authentication errors, where the following structure is returned:  <pre> {   \"error\": \"invalid_token\",   \"error_description\": \"Invalid access token: cccbce46-xxxx-xxxx-xxxx-xxxxxxxxxx\" } </pre>  <h3 id=\"general-paging\"><strong>Paging</strong></h3> API services that may potentially return a lot of data implement paging. They return a limited number of entries within a \"page\". Further entries must be fetched with subsequent calls. <br/><br/> Any API service that implements paging provides the following input parameters:<br/> &bull; \"page\": the number of the page to be retrieved (starting with 1).<br/> &bull; \"perPage\": the number of entries within a page. The default and maximum value is stated in the documentation of the respective services.  A paged response contains an additional \"paging\" object with the following structure:  <pre> {   ...   ,   \"paging\": {     \"page\": 1,     \"perPage\": 20,     \"pageCount\": 234,     \"totalCount\": 4662   } } </pre>  <h3 id=\"general-internationalization\"><strong>Internationalization</strong></h3> The finAPI services support internationalization which means you can define the language you prefer for API service responses. <br/><br/> The following languages are available: German, English, Czech, Slovak. <br/><br/> The preferred language can be defined by providing the official HTTP <strong>Accept-Language</strong> header. <br/><br/> finAPI reacts on the official iso language codes &quot;de&quot;, &quot;en&quot;, &quot;cs&quot; and &quot;sk&quot; for the named languages. Additional subtags supported by the Accept-Language header may be provided, e.g. &quot;en-US&quot;, but are ignored. <br/> If no Accept-Language header is given, German is used as the default language. <br/><br/> Exceptions:<br/> &bull; Bank login hints and login fields are only available in the language of the bank and not being translated.<br/> &bull; Direct messages from the bank systems typically returned as BUSINESS errors will not be translated.<br/> &bull; BUSINESS errors created by finAPI directly are available in German and English.<br/> &bull; TECHNICAL errors messages meant for developers are mostly in English, but also may be translated.  <h3 id=\"general-request-ids\"><strong>Request IDs</strong></h3> With any API call, you can pass a request ID via a header with name \"X-Request-Id\". The request ID can be an arbitrary string with up to 255 characters. Passing a longer string will result in an error. <br/><br/> If you don't pass a request ID for a call, finAPI will generate a random ID internally. <br/><br/> The request ID is always returned back in the response of a service, as a header with name \"X-Request-Id\". <br/><br/> We highly recommend to always pass a (preferably unique) request ID, and include it into your client application logs whenever you make a request or receive a response (especially in the case of an error response). finAPI is also logging request IDs on its end. Having a request ID can help the finAPI support team to work more efficiently and solve tickets faster.  <h3 id=\"general-overriding-http-methods\"><strong>Overriding HTTP methods</strong></h3> Some HTTP clients do not support the HTTP methods PATCH or DELETE. If you are using such a client in your application, you can use a POST request instead with a special HTTP header indicating the originally intended HTTP method. <br/><br/> The header's name is <strong>X-HTTP-Method-Override</strong>. Set its value to either <strong>PATCH</strong> or <strong>DELETE</strong>. POST Requests having this header set will be treated either as PATCH or DELETE by the finAPI servers. <br/><br/> Example: <br/><br/> <strong>X-HTTP-Method-Override: PATCH</strong><br/> POST /api/v1/label/51<br/> {\"name\": \"changed label\"}<br/><br/> will be interpreted by finAPI as:<br/><br/> PATCH /api/v1/label/51<br/> {\"name\": \"changed label\"}<br/>  <h3 id=\"general-user-metadata\"><strong>User metadata</strong></h3> With the migration to PSD2 APIs, a new term called \"User metadata\" (also known as \"PSU metadata\") has been introduced to the API. This user metadata aims to inform the banking API if there was a real end-user behind an HTTP request or if the request was triggered by a system (e.g. by an automatic batch update). In the latter case, the bank may apply some restrictions such as limiting the number of HTTP requests for a single consent. Also, some operations may be forbidden entirely by the banking API. For example, some banks do not allow issuing a new consent without the end-user being involved. Therefore, it is certainly necessary and obligatory for the customer to provide the PSU metadata for such operations. <br/><br/> As finAPI does not have direct interaction with the end-user, it is the client application's responsibility to provide all the necessary information about the end-user. This must be done by sending additional headers with every request triggered on behalf of the end-user. <br/><br/> At the moment, the following headers are supported by the API:<br/> &bull; \"PSU-IP-Address\" - the IP address of the user's device.<br/> &bull; \"PSU-Device-OS\" - the user's device and/or operating system identification.<br/> &bull; \"PSU-User-Agent\" - the user's web browser or other client device identification.  <h3 id=\"general-faq\"><strong>FAQ</strong></h3> <strong>Is there a finAPI SDK?</strong> <br/> Currently we do not offer a native SDK, but there is the option to generate an SDK for almost any target language via OpenAPI. Use the 'Download SDK' button on this page for SDK generation. <br/> <br/> <strong>How can I enable finAPI's automatic batch update?</strong> <br/> Currently there is no way to set up the batch update via the API. Please contact support@finapi.io for this. <br/> <br/> <strong>Why do I need to keep authorizing when calling services on this page?</strong> <br/> This page is a \"one-page-app\". Reloading the page resets the OAuth authorization context. There is generally no need to reload the page, so just don't do it and your authorization will persist. 
 *
 * API version: 1.151.1
 * Contact: kontakt@finapi.io
 */

// Code generated by OpenAPI Generator (https://openapi-generator.tech); DO NOT EDIT.

package finapi

import (
	"context"
	"fmt"
	"net/http"
	"strings"
)

// contextKeys are used to identify the type of value in the context.
// Since these are string, it is possible to get a short description of the
// context key for logging and debugging using key.String().

type contextKey string

func (c contextKey) String() string {
	return "auth " + string(c)
}

var (
	// ContextOAuth2 takes an oauth2.TokenSource as authentication for the request.
	ContextOAuth2 = contextKey("token")

	// ContextBasicAuth takes BasicAuth as authentication for the request.
	ContextBasicAuth = contextKey("basic")

	// ContextAccessToken takes a string oauth2 access token as authentication for the request.
	ContextAccessToken = contextKey("accesstoken")

	// ContextAPIKeys takes a string apikey as authentication for the request
	ContextAPIKeys = contextKey("apiKeys")

	// ContextHttpSignatureAuth takes HttpSignatureAuth as authentication for the request.
	ContextHttpSignatureAuth = contextKey("httpsignature")

	// ContextServerIndex uses a server configuration from the index.
	ContextServerIndex = contextKey("serverIndex")

	// ContextOperationServerIndices uses a server configuration from the index mapping.
	ContextOperationServerIndices = contextKey("serverOperationIndices")

	// ContextServerVariables overrides a server configuration variables.
	ContextServerVariables = contextKey("serverVariables")

	// ContextOperationServerVariables overrides a server configuration variables using operation specific values.
	ContextOperationServerVariables = contextKey("serverOperationVariables")
)

// BasicAuth provides basic http authentication to a request passed via context using ContextBasicAuth
type BasicAuth struct {
	UserName string `json:"userName,omitempty"`
	Password string `json:"password,omitempty"`
}

// APIKey provides API key based authentication to a request passed via context using ContextAPIKey
type APIKey struct {
	Key    string
	Prefix string
}

// ServerVariable stores the information about a server variable
type ServerVariable struct {
	Description  string
	DefaultValue string
	EnumValues   []string
}

// ServerConfiguration stores the information about a server
type ServerConfiguration struct {
	URL string
	Description string
	Variables map[string]ServerVariable
}

// ServerConfigurations stores multiple ServerConfiguration items
type ServerConfigurations []ServerConfiguration

// Configuration stores the configuration of the API client
type Configuration struct {
	Host             string            `json:"host,omitempty"`
	Scheme           string            `json:"scheme,omitempty"`
	DefaultHeader    map[string]string `json:"defaultHeader,omitempty"`
	UserAgent        string            `json:"userAgent,omitempty"`
	Debug            bool              `json:"debug,omitempty"`
	Servers          ServerConfigurations
	OperationServers map[string]ServerConfigurations
	HTTPClient       *http.Client
}

// NewConfiguration returns a new Configuration object
func NewConfiguration() *Configuration {
	cfg := &Configuration{
		DefaultHeader:    make(map[string]string),
		UserAgent:        "OpenAPI-Generator/1.0.0/go",
		Debug:            false,
		Servers:          ServerConfigurations{
			{
				URL: "https://sandbox.finapi.io",
				Description: "finAPI sandbox environment",
			},
		},
		OperationServers: map[string]ServerConfigurations{
		},
	}
	return cfg
}

// AddDefaultHeader adds a new HTTP header to the default header in the request
func (c *Configuration) AddDefaultHeader(key string, value string) {
	c.DefaultHeader[key] = value
}

// URL formats template on a index using given variables
func (sc ServerConfigurations) URL(index int, variables map[string]string) (string, error) {
	if index < 0 || len(sc) <= index {
		return "", fmt.Errorf("Index %v out of range %v", index, len(sc)-1)
	}
	server := sc[index]
	url := server.URL

	// go through variables and replace placeholders
	for name, variable := range server.Variables {
		if value, ok := variables[name]; ok {
			found := bool(len(variable.EnumValues) == 0)
			for _, enumValue := range variable.EnumValues {
				if value == enumValue {
					found = true
				}
			}
			if !found {
				return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
			}
			url = strings.Replace(url, "{"+name+"}", value, -1)
		} else {
			url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
		}
	}
	return url, nil
}

// ServerURL returns URL based on server settings
func (c *Configuration) ServerURL(index int, variables map[string]string) (string, error) {
	return c.Servers.URL(index, variables)
}

func getServerIndex(ctx context.Context) (int, error) {
	si := ctx.Value(ContextServerIndex)
	if si != nil {
		if index, ok := si.(int); ok {
			return index, nil
		}
		return 0, reportError("Invalid type %T should be int", si)
	}
	return 0, nil
}

func getServerOperationIndex(ctx context.Context, endpoint string) (int, error) {
	osi := ctx.Value(ContextOperationServerIndices)
	if osi != nil {
		if operationIndices, ok := osi.(map[string]int); !ok {
			return 0, reportError("Invalid type %T should be map[string]int", osi)
		} else {
			index, ok := operationIndices[endpoint]
			if ok {
				return index, nil
			}
		}
	}
	return getServerIndex(ctx)
}

func getServerVariables(ctx context.Context) (map[string]string, error) {
	sv := ctx.Value(ContextServerVariables)
	if sv != nil {
		if variables, ok := sv.(map[string]string); ok {
			return variables, nil
		}
		return nil, reportError("ctx value of ContextServerVariables has invalid type %T should be map[string]string", sv)
	}
	return nil, nil
}

func getServerOperationVariables(ctx context.Context, endpoint string) (map[string]string, error) {
	osv := ctx.Value(ContextOperationServerVariables)
	if osv != nil {
		if operationVariables, ok := osv.(map[string]map[string]string); !ok {
			return nil, reportError("ctx value of ContextOperationServerVariables has invalid type %T should be map[string]map[string]string", osv)
		} else {
			variables, ok := operationVariables[endpoint]
			if ok {
				return variables, nil
			}
		}
	}
	return getServerVariables(ctx)
}

// ServerURLWithContext returns a new server URL given an endpoint
func (c *Configuration) ServerURLWithContext(ctx context.Context, endpoint string) (string, error) {
	sc, ok := c.OperationServers[endpoint]
	if !ok {
		sc = c.Servers
	}

	if ctx == nil {
		return sc.URL(0, nil)
	}

	index, err := getServerOperationIndex(ctx, endpoint)
	if err != nil {
		return "", err
	}

	variables, err := getServerOperationVariables(ctx, endpoint)
	if err != nil {
		return "", err
	}

	return sc.URL(index, variables)
}