80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
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package config
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"strings"
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)
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// Parse builds a server configuration from a json reader and checks for most format errors.
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func Parse(r io.Reader) (Services, error) {
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services := make(Services, 0)
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err := json.NewDecoder(r).Decode(&services)
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if err != nil {
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return nil, fmt.Errorf("%s: %w", ErrRead, err)
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}
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err = services.checkAndFormat()
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if err != nil {
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return nil, fmt.Errorf("%s: %w", ErrFormat, err)
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}
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if services.collide() {
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return nil, fmt.Errorf("%s: %w", ErrFormat, ErrPatternCollision)
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}
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return services, nil
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}
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// collide returns if there is collision between services
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func (svc Services) collide() bool {
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// todo: implement pattern collision using types to check if braces can be equal to fixed uri parts
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return false
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}
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// Find a service matching an incoming HTTP request
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func (svc Services) Find(r *http.Request) *Service {
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for _, service := range svc {
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if service.Match(r) {
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return service
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}
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}
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return nil
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}
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// checkAndFormat checks for errors and missing fields and sets default values for optional fields.
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func (svc Services) checkAndFormat() error {
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for _, service := range svc {
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// check method
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err := service.checkMethod()
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if err != nil {
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return fmt.Errorf("%s '%s' [method]: %w", service.Method, service.Pattern, err)
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}
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// check pattern
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service.Pattern = strings.Trim(service.Pattern, " \t\r\n")
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err = service.checkPattern()
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if err != nil {
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return fmt.Errorf("%s '%s' [path]: %w", service.Method, service.Pattern, err)
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}
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// check description
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if len(strings.Trim(service.Description, " \t\r\n")) < 1 {
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return fmt.Errorf("%s '%s' [description]: %w", service.Method, service.Pattern, ErrMissingDescription)
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}
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// check input parameters
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err = service.checkAndFormatInput()
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if err != nil {
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return fmt.Errorf("%s '%s' [in]: %w", service.Method, service.Pattern, err)
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}
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}
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return nil
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}
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