/
providers.go
96 lines (79 loc) · 2.82 KB
/
providers.go
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// Package providers is used to load all the supported credential providers
// that can be used to get credentials.
package providers
import (
"errors"
"fmt"
"os"
"strings"
"github.com/mitchellh/mapstructure"
"github.com/nuttmeister/pm-creds/internal/paths"
"github.com/nuttmeister/pm-creds/internal/providers/aws"
"github.com/nuttmeister/pm-creds/internal/providers/types"
"github.com/pelletier/go-toml"
)
// Providers contains all providers loaded.
type Providers struct {
providers map[string]types.Provider
}
// Get will return the provider with name or error if it doesn't exists.
func (p *Providers) Get(name string) (types.Provider, error) {
provider, ok := p.providers[name]
if !ok {
return nil, fmt.Errorf("providers: provider %q doesn't exists", name)
}
return provider, nil
}
// Load will load and create providers from config directory cfgDir.
func Load(cfgDir string) (*Providers, error) {
providers := map[string]types.Provider{}
rawProviders, err := loadProviders(cfgDir)
if err != nil {
return nil, fmt.Errorf("providers: couldn't load providers. %w", err)
}
for name, data := range rawProviders {
provider, err := parseProvider(name, data)
if err != nil {
return nil, fmt.Errorf("providers: couldn't parse providers. %w", err)
}
providers[name] = provider
}
return &Providers{providers: providers}, nil
}
// loadProviders will read providers from file fn and toml unmarshal it's content.
func loadProviders(cfgDir string) (map[string]interface{}, error) {
fn := paths.ProvidersFile(cfgDir)
file, err := os.ReadFile(fn)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return nil, fmt.Errorf("file %q doesn't exist. use --create-config to create default providers", fn)
}
return nil, fmt.Errorf("couldn't read file %q. %w", fn, err)
}
rawProviders := map[string]interface{}{}
if err := toml.Unmarshal(file, &rawProviders); err != nil {
return nil, fmt.Errorf("couldn't toml unmarshal file %q. %w", fn, err)
}
return rawProviders, nil
}
// parseProvider will parse the provider data to make sure it satisfies the minimum data
// required for it to be created. It will also call the corrept provider package
// depending on what type was set in the data provided.
func parseProvider(name string, data interface{}) (types.Provider, error) {
raw, ok := data.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("couldn't read config of provider %q", name)
}
cfg := &struct {
Type string `mapstructure:"type"`
}{}
if err := mapstructure.Decode(raw, cfg); err != nil {
return nil, fmt.Errorf("couldn't decode field %s from data for %q. %w", "type", name, err)
}
// Add more providers that satisfies the Provider interface here.
switch strings.ToLower(cfg.Type) {
case "aws":
return aws.Create(name, raw)
}
return nil, fmt.Errorf("provider %q has an invalid %q", cfg.Type, "type")
}