feat(filters): Add configurable filters for incoming jobs

Signed-off-by: Richard Palethorpe <io@richiejp.com>

services/filters/regex.go

@@ -0,0 +1,86 @@
+package filters
+
+import (
+	"encoding/json"
+	"regexp"
+
+	"github.com/mudler/LocalAGI/core/types"
+	"github.com/mudler/LocalAGI/pkg/config"
+)
+
+const FilterRegex = "regex"
+
+type RegexFilter struct {
+	name         string
+	pattern      *regexp.Regexp
+	allowOnMatch bool
+	isTrigger    bool
+}
+
+type RegexFilterConfig struct {
+	Name         string `json:"name"`
+	Pattern      string `json:"pattern"`
+	AllowOnMatch bool   `json:"allow_on_match"`
+	IsTrigger    bool   `json:"is_trigger"`
+}
+
+func NewRegexFilter(configJSON string) (*RegexFilter, error) {
+	var cfg RegexFilterConfig
+	if err := json.Unmarshal([]byte(configJSON), &cfg); err != nil {
+		return nil, err
+	}
+	re, err := regexp.Compile(cfg.Pattern)
+	if err != nil {
+		return nil, err
+	}
+	return &RegexFilter{
+		name:         cfg.Name,
+		pattern:      re,
+		allowOnMatch: cfg.AllowOnMatch,
+		isTrigger:    cfg.IsTrigger,
+	}, nil
+}
+
+func (f *RegexFilter) Name() string { return f.name }
+func (f *RegexFilter) Apply(job *types.Job) (bool, error) {
+	input := extractInputFromJob(job)
+	if f.pattern.MatchString(input) {
+		return f.allowOnMatch, nil
+	}
+	return !f.allowOnMatch, nil
+}
+
+func (f *RegexFilter) IsTrigger() bool {
+	return f.isTrigger
+}
+
+func RegexFilterConfigMeta() config.FieldGroup {
+	return config.FieldGroup{
+		Name:  FilterRegex,
+		Label: "Regex Filter/Trigger",
+		Fields: []config.Field{
+			{Name: "name", Label: "Name", Type: "text", Required: true},
+			{Name: "pattern", Label: "Pattern", Type: "text", Required: true},
+			{Name: "allow_on_match", Label: "Allow on Match", Type: "checkbox", Required: true},
+			{Name: "is_trigger", Label: "Is Trigger", Type: "checkbox", Required: true},
+		},
+	}
+}
+
+// extractInputFromJob attempts to extract a string input for filtering.
+func extractInputFromJob(job *types.Job) string {
+	if job.Metadata != nil {
+		if v, ok := job.Metadata["input"]; ok {
+			if s, ok := v.(string); ok {
+				return s
+			}
+		}
+	}
+	// fallback: try to use conversation history if available
+	if len(job.ConversationHistory) > 0 {
+		// Use the last message content
+		last := job.ConversationHistory[len(job.ConversationHistory)-1]
+		return last.Content
+	}
+	return ""
+}