101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
package lib
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import (
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"strings"
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)
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// TranslateKeys recursively translates all keys from m in-place to their
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// canonical form as defined in dict which maps an alias name to the canonical
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// name. If m already has a value for the canonical name then that one is used
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// and the value for the alias name is discarded. Alias names are matched
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// case-insensitive.
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//
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// Example:
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//
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// m = TranslateKeys(m, map[string]string{"snake_case": "CamelCase"})
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//
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// If the canonical string provided is the empty string, the effect is to stop
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// recursing into any key matching the left hand side. In this case the left
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// hand side must use periods to specify a full path e.g.
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// `connect.proxy.config`. The path must be the canonical key names (i.e.
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// CamelCase) AFTER translation so NodeName not node_name. These are still match
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// in a case-insensitive way.
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//
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// This is needed for example because parts of the Service Definition are
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// "opaque" maps of metadata or config passed to another process or component.
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// If we allow translation to recurse we might mangle the "opaque" keys given
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// where the clash with key names in other parts of the definition :sob:
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//
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// Example:
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// m - TranslateKeys(m, map[string]string{
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// "foo_bar": "FooBar",
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// "widget.config": "",
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// // Assume widgets is an array, this will prevent recursing into any
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// // item's config field
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// "widgets.config": "",
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// })
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//
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// Deprecated: Use lib/decode.HookTranslateKeys instead.
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func TranslateKeys(v map[string]interface{}, dict map[string]string) {
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// Convert all dict keys for exclusions to lower. so we can match against them
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// unambiguously with a single lookup.
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for k, v := range dict {
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if v == "" {
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dict[strings.ToLower(k)] = ""
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}
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}
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ck(v, dict, "")
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}
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func ck(v interface{}, dict map[string]string, pathPfx string) interface{} {
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// In array case we don't add a path segment for the item as they are all
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// assumed to be same which is why we check the prefix doesn't already end in
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// a .
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if pathPfx != "" && !strings.HasSuffix(pathPfx, ".") {
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pathPfx += "."
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}
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switch x := v.(type) {
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case map[string]interface{}:
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for k, v := range x {
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lowerK := strings.ToLower(k)
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// Check if this path has been excluded
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val, ok := dict[pathPfx+lowerK]
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if ok && val == "" {
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// Don't recurse into this key
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continue
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}
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canonKey, ok := dict[lowerK]
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// no canonical key? -> use this key
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if !ok {
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x[k] = ck(v, dict, pathPfx+lowerK)
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continue
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}
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// delete the alias
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delete(x, k)
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// if there is a value for the canonical key then keep it
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if _, ok := x[canonKey]; ok {
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continue
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}
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// otherwise translate to the canonical key
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x[canonKey] = ck(v, dict, pathPfx+strings.ToLower(canonKey))
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}
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return x
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case []interface{}:
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var a []interface{}
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for _, xv := range x {
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a = append(a, ck(xv, dict, pathPfx))
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}
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return a
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default:
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return v
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}
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}
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