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Update with @danawillow's feedback.

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* Make our regexes more permissive (though still separated out for
  readability, despite being identical)
* Add a helper that will improve readability while sanity testing our
  regex results.
This commit is contained in:
Paddy 2017-03-13 16:39:42 -07:00
parent 869c7a6103
commit a633853770
1 changed files with 28 additions and 21 deletions
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49
image.go
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@ -9,9 +9,9 @@ import (
)
const (
resolveImageProjectRegex = "[a-z](?:[-a-z0-9]{0,61}[a-z0-9])?" // TODO(paddy): this isn't based on any documentation; we're just copying the image name restrictions. Need to follow up with @danawillow and/or @evandbrown and see if there's an actual limit to this
resolveImageFamilyRegex = "[a-z](?:[-a-z0-9]{0,61}[a-z0-9])?" // TODO(paddy): this isn't based on any documentation; we're just copying the image name restrictions. Need to follow up with @danawillow and/or @evandbrown and see if there's an actual limit to this
resolveImageImageRegex = "[a-z](?:[-a-z0-9]{0,61}[a-z0-9])?" // 1-63 characters, lowercase letters, numbers, and hyphens only, beginning and ending in a lowercase letter or number
resolveImageProjectRegex = "[-_a-zA-Z0-9]*"
resolveImageFamilyRegex = "[-_a-zA-Z0-9]*"
resolveImageImageRegex = "[-_a-zA-Z0-9]*"
)
var (
@ -47,6 +47,13 @@ func resolveImageFamilyExists(c *Config, project, name string) (bool, error) {
}
}
func sanityTestRegexMatches(expected int, got []string, regexType, name string) error {
if len(got)-1 != expected { // subtract one, index zero is the entire matched expression
return fmt.Errorf("Expected %d %s regex matches, got %d for %s", 2, regexType, len(got)-1, name)
}
return nil
}
// If the given name is a URL, return it.
// If it's in the form projects/{project}/global/images/{image}, return it
// If it's in the form projects/{project}/global/images/family/{family}, return it
@ -85,32 +92,32 @@ func resolveImage(c *Config, name string) (string, error) {
return name, nil
case resolveImageProjectImage.MatchString(name): // projects/xyz/global/images/xyz
res := resolveImageProjectImage.FindStringSubmatch(name)
if len(res)-1 != 2 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d project image regex matches, got %d for %s", 2, len(res)-1, 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 len(res)-1 != 2 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d project family regex matches, got %d for %s", 2, len(res)-1, 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 len(res)-1 != 1 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d global image regex matches, got %d for %s", 1, len(res)-1, 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 len(res)-1 != 1 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d global family regex matches, got %d for %s", 1, len(res)-1, 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 len(res)-1 != 1 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d family family regex matches, got %d for %s", 1, len(res)-1, name)
if err := sanityTestRegexMatches(1, res, "family family", name); err != nil {
return "", err
}
if ok, err := resolveImageFamilyExists(c, c.Project, res[1]); err != nil {
return "", err
@ -126,8 +133,8 @@ func resolveImage(c *Config, name string) (string, error) {
}
case resolveImageProjectImageShorthand.MatchString(name): // xyz/xyz
res := resolveImageProjectImageShorthand.FindStringSubmatch(name)
if len(res)-1 != 2 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d project image shorthand regex matches, got %d for %s", 2, len(res)-1, name)
if err := sanityTestRegexMatches(2, res, "project image shorthand", name); err != nil {
return "", err
}
if ok, err := resolveImageImageExists(c, res[1], res[2]); err != nil {
return "", err
@ -137,8 +144,8 @@ func resolveImage(c *Config, name string) (string, error) {
fallthrough // check if it's a family
case resolveImageProjectFamilyShorthand.MatchString(name): // xyz/xyz
res := resolveImageProjectFamilyShorthand.FindStringSubmatch(name)
if len(res)-1 != 2 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d project family shorthand regex matches, got %d for %s", 2, len(res)-1, name)
if err := sanityTestRegexMatches(2, res, "project family shorthand", name); err != nil {
return "", err
}
if ok, err := resolveImageFamilyExists(c, res[1], res[2]); err != nil {
return "", err
@ -147,8 +154,8 @@ func resolveImage(c *Config, name string) (string, error) {
}
case resolveImageImage.MatchString(name): // xyz
res := resolveImageImage.FindStringSubmatch(name)
if len(res)-1 != 1 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d image regex matches, got %d for %s", 1, len(res)-1, name)
if err := sanityTestRegexMatches(1, res, "image", name); err != nil {
return "", err
}
if ok, err := resolveImageImageExists(c, c.Project, res[1]); err != nil {
return "", err
@ -166,8 +173,8 @@ func resolveImage(c *Config, name string) (string, error) {
fallthrough // check if the name is a family, instead of an image
case resolveImageFamily.MatchString(name): // xyz
res := resolveImageFamily.FindStringSubmatch(name)
if len(res)-1 != 1 { // subtract one, index zero is the entire matched expression
return "", fmt.Errorf("Expected %d family regex matches, got %d for %s", 1, len(res)-1, name)
if err := sanityTestRegexMatches(1, res, "family", name); err != nil {
return "", err
}
if ok, err := resolveImageFamilyExists(c, c.Project, res[1]); err != nil {
return "", err