func ResolveImage()

in tfplan2cai/converters/google/resources/services/compute/image.go [98:213]
114 lines of code
43 McCabe index (conditional complexity)

func ResolveImage(c *transport_tpg.Config, project, name, userAgent string) (string, error) {
	var builtInProject string
	for k, v := range ImageMap {
		if strings.Contains(name, k) {
			builtInProject = v
			if builtInProject == "coreos-cloud" && strings.Contains(name, "fedora") {
				builtInProject = ImageMap["fedora-coreos"]
			}
			break
		}
	}
	switch {
	case resolveImageLink.MatchString(name): // https://www.googleapis.com/compute/v1/projects/xyz/global/images/xyz
		return name, nil
	case resolveImageProjectImage.MatchString(name): // projects/xyz/global/images/xyz
		res := resolveImageProjectImage.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project image", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("projects/%s/global/images/%s", res[1], res[2]), nil
	case resolveImageProjectFamily.MatchString(name): // projects/xyz/global/images/family/xyz
		res := resolveImageProjectFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project family", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("projects/%s/global/images/family/%s", res[1], res[2]), nil
	case resolveImageGlobalImage.MatchString(name): // global/images/xyz
		res := resolveImageGlobalImage.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "global image", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("global/images/%s", res[1]), nil
	case resolveImageGlobalFamily.MatchString(name): // global/images/family/xyz
		res := resolveImageGlobalFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "global family", name); err != nil {
			return "", err
		}
		return fmt.Sprintf("global/images/family/%s", res[1]), nil
	case resolveImageFamilyFamily.MatchString(name): // family/xyz
		res := resolveImageFamilyFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "family family", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageFamilyExists(c, project, res[1], userAgent); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("global/images/family/%s", res[1]), nil
		}
		if builtInProject != "" {
			if ok, err := resolveImageFamilyExists(c, builtInProject, res[1], userAgent); err != nil {
				return "", err
			} else if ok {
				return fmt.Sprintf("projects/%s/global/images/family/%s", builtInProject, res[1]), nil
			}
		}
	case resolveImageProjectImageShorthand.MatchString(name): // xyz/xyz
		res := resolveImageProjectImageShorthand.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project image shorthand", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageImageExists(c, res[1], res[2], userAgent); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("projects/%s/global/images/%s", res[1], res[2]), nil
		}
		fallthrough // check if it's a family
	case resolveImageProjectFamilyShorthand.MatchString(name): // xyz/xyz
		res := resolveImageProjectFamilyShorthand.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(2, res, "project family shorthand", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageFamilyExists(c, res[1], res[2], userAgent); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("projects/%s/global/images/family/%s", res[1], res[2]), nil
		}
	case resolveImageImage.MatchString(name): // xyz
		res := resolveImageImage.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "image", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageImageExists(c, project, res[1], userAgent); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("global/images/%s", res[1]), nil
		}
		if builtInProject != "" {
			// check the images GCP provides
			if ok, err := resolveImageImageExists(c, builtInProject, res[1], userAgent); err != nil {
				return "", err
			} else if ok {
				return fmt.Sprintf("projects/%s/global/images/%s", builtInProject, res[1]), nil
			}
		}
		fallthrough // check if the name is a family, instead of an image
	case resolveImageFamily.MatchString(name): // xyz
		res := resolveImageFamily.FindStringSubmatch(name)
		if err := sanityTestRegexMatches(1, res, "family", name); err != nil {
			return "", err
		}
		if ok, err := resolveImageFamilyExists(c, c.Project, res[1], userAgent); err != nil {
			return "", err
		} else if ok {
			return fmt.Sprintf("global/images/family/%s", res[1]), nil
		}
		if builtInProject != "" {
			// check the families GCP provides
			if ok, err := resolveImageFamilyExists(c, builtInProject, res[1], userAgent); err != nil {
				return "", err
			} else if ok {
				return fmt.Sprintf("projects/%s/global/images/family/%s", builtInProject, res[1]), nil
			}
		}
	}
	return "", fmt.Errorf("Could not find image or family %s", name)
}